This opinion article first appeared in the Washington Post.

Most world leaders, including President Biden and Japanese Prime Minister Fumio Kishida, agree that the defense of Taiwan is crucial for regional security. But most options for improving deterrence will take too long. Building Taiwan’s self-defense, developing more U.S. firepower in the region, creating the economic resilience to make severe sanctions feasible: None of these will come to fruition before 2030.

Japan could change the game now. Allied forces, responding immediately and en masse, have a chance of thwarting a Chinese invasion, according to a recent report from the Center for Strategic & International Studies. But, in meetings with high-level officials in Tokyo last month, I sensed a mismatch between talk and walk. Japan must broaden its vision of self-defense to encompass priorities and declaratory policies that will avert calamity in the region. Tokyo cannot wait until war breaks out to start the tougher conversations.

Here’s why.

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First, without Japan, the United States could be outgunned in a fight to defend Taiwan, notwithstanding Washington’s new basing agreement with the Philippines. A combined U.S.-Japan fleet, on the other hand, would boast more than three times as many aircraft carriers, cruisers and destroyers as the People’s Liberation Army Navy. The quality of many Japanese ships approaches that of its U.S. counterparts. Eight of Japan’s destroyers field a state-of-the-art Aegis weapons system used by some of the more advanced ships in the U.S. Navy.

Second, Japan’s involvement could mitigate some of the geographic vulnerabilities of the United States. Adding Japanese bases more than doubles the locations from which the two countries together could conduct operations. Japan’s southwestern islands are closer to Taiwan than mainland China. Take Yonaguni Island, just about 70 miles from Taiwan’s east coast. On it are intelligence, surveillance and reconnaissance assets, as well as anti-ship and anti-aircraft capabilities. Operating from these bases in the defense of Taiwan, allied forces would have more opportunities to quickly target an invading force. That would make attacks on U.S. bases in Japan, such as Kadena, at the southernmost tip of the archipelago, less attractive to the Chinese. Such strikes would no longer completely cripple an air effort.

Third, Japan has military strengths that would make a fait accompli almost impossible for China. Though Japanese diesel submarines are slower than U.S. counterparts, they could reach the Taiwan Strait in just two days. U.S. submarines departing from Hawaii would take at least a week; from San Diego even longer. This makes Japan the first line of defense for Taiwan. Japanese boats could also monitor key choke points through which Chinese navy submarines would be attempting to exit the First Island Chain in the western Pacific. This would free up the quieter submarines of the U.S. Navy to wreak havoc on amphibious vessels and escort ships.

In short, Tokyo could contribute significantly to a military effort to deny China the ability to take Taiwan by force. To do so, Japan must increase its stockpile of torpedoes and long-range strike weapons, as planned. Tokyo must be willing to go after the amphibious invasion force and targets on mainland China — a very controversial proposition indeed.

On the surface, it looks as if Japan is moving in the right direction. The government took the groundbreaking historic step of increasing defense spending to 2 percent of Japan’s gross domestic product over the next five years. This meant a whopping 26.3 percent increase in 2023 alone. The greatest increase in the past was in 1986, by nearly 50 percent.

Last year, former prime minister Shinzo Abe stated that the security of Japan is connected to Taiwan. He said a Chinese use of force against a U.S. vessel defending Taiwan could legally trigger the deployment of Japan’s military (known as the Self-Defense Force).

Indeed, a 2015 law allows Japan to engage in collective defense when presented with an existential threat. This provides plenty of flexibility for Japan to fight alongside the United States without the need for a constitutional amendment. The officials I spoke with in Tokyo were firm that Japan would respond if China attacked U.S. bases such as Kadena.

But all these initiatives concern self-defense. Japan does worry that military activity around Taiwan could extend to the security of its southwestern islands. Or that if China takes Taiwan, it would be emboldened to take the Senkaku/Diaoyu islands, which Tokyo administers but which China also claims. There are even concerns that Okinawa, a group of 160-plus islands that is home to 1.4 million people (and dozens of U.S. bases), could then prove enticing to Beijing.

Crudely, Japan seems to be prepared to push back against only Chinese assets that are clearly poised to attack its sovereign territory. Those heading toward Taiwan? Not so much.

While a degree of strategic ambiguity makes sense, too much could backfire. If Japan is clearly unwilling to defend Taiwan, then improvements in Japanese military capabilities will do little to deter conflict across the strait. Japanese officials don’t need to say they would attack any Chinese invading forces, but they need to let their counterparts know it is a real possibility. The officials I met were unwilling to send such strong messages; some insisted reassuring Beijing was more important.

Tokyo must make clear at home and abroad that defending Taiwan is no longer off the table. The prospect of Japan engaging in offensive operations in the defense of Taiwan would stay Chinese President Xi Jinping’s hand. Only then would recent monumental changes in Japanese politics fulfill their potential in contributing to peace and security in Asia. If Ukraine has taught us anything, it is that deterrence is costly, but war is worse.

Click the link for a full transcript of “What We Need To Talk About When We Talk About Taiwan.“

The Likelihood of Invasion

In stark terms, Oriana Skylar Mastro, a center fellow at the Freeman Spogli Institute for International Studies, believes there’s a 100% chance China will use some sort of force against Taiwan in the next five years. For the last twenty years, China has been making concerted efforts to modernize its military and increase its capabilities not only to assert force against Taiwan, but to deter intervention from the United States.

In the majority of scenarios, the United States wins in a conflict with China over Taiwan. But the United States also carries a distinct geographic disadvantage. The distance across the Taiwan Strait between the island and mainland China is approximately 100 miles, which is roughly the distance between Richmond, Virginia and Washington D.C. If China moves quickly, PRC forces could take Taiwan before U.S. forces have time to move into position.

When considering possible outcomes in Taiwan, it is equally important to consider the motivations driving Beijing’s ambitions. The leadership on the mainland has been planning and thinking about how to retake Taiwan since 1949. With the modernized capabilities coming online, the balance of power has shifted in China’s military favor, and the cost-benefit calculus favors Beijing’s ambitions. The long-term planning stage is now reaching its end, and the prospects of direct action are increasing.

The View from Taipei

Political leaders in Taiwan recognize the growing danger they face across the Strait. In Larry Diamond’s assessment, the end of Hong Kong's autonomy and the suppression of the “one country, two systems” model, the rising military incursions into Taiwan's air defense identification zone and coastal waters, and the whole rising pace of Chinese military intimidation has sobered Taiwan and visibly impacted Taiwanese public opinion.

Concerningly though, while the political elite recognize the real and present danger of the situation, polling of the general Taiwan public suggests that the vast majority of citizens still feel like an attack or an invasion by China is unlikely. Similar majorities suggest that they would be willing to fight in Taiwan’s defense, but volunteering for military service remains at a minimum.

To maximize safety, Taiwan needs to find ways to strengthen itself in its ability to defend, resist, and deter China, while still avoiding any appearance of moving toward permanent independence or any other action that could be deemed by Beijing as a provocation, says Diamond.

What the United States Can Do

When it comes to the defense of Taiwan, the strategic crutch hobbling the United States is geography. Most of the U.S. Pacific forces are not in Asia. The majority are in Hawaii and California, as well as a few bases and airfields in Japan. To be able to effectively deter China, the U.S. needs far greater forward deployed military capability in order to be able to either stop or stall the movement of Chinese troops into Taiwan, says Mastro.

Taiwan needs greater onshore military deterrence capabilities as well. One such strategy is the “porcupine approach,” which increases the number of smaller mobile lethal weapons. By Larry Diamond’s assessment, increased citizen participation in military training is also crucial, with an emphasis on weapons training and urban defense tactics. The U.S. could support these aims by overhauling the current system for weapons procurement to speed up the production and delivery of weapons systems not just for Taiwan, but to the benefit of U.S. defense and other contingencies as well. Working with leadership to create strategic stockpiles of food, and energy should also be a priority, says Diamond.

The U.S. also needs to put much more effort into its diplomatic efforts on behalf of Taiwan. Many U.S. allies and partners are reluctant to ostracize China because of economic ties and concerns over sparking their own conflict with China in the future. A key ally in all of this is Japan. If Japan fights with the United States on behalf of Taiwan, it is a guaranteed win and enough to effectively deter China. But much more needs to be done much more quickly in order to secure those guarantees and present them in a convincing way to Beijing.

“The clock is ticking,” Larry Diamond says. “And the problem is we don’t know how fast it’s ticking. “Taiwan is moving in the right direction. But we need to move faster than we're moving.”

Click here for a transcript of “We Need To Rethink Our Assumptions about China’s Strategic Goals”

Where China Was in the 1990s

Twenty years ago, the Chinese-Taiwan invasion plan was to take a couple of fishing vessels and paddle their way across the strait. In the 1990s, China had very limited, and often no ability to fly over water, or at night, or in weather, and their ships had no defenses.

For many, many years we knew that China was willing to fight if Taiwan declared independence. Fighting a war in any country that is big and resolved is problematic. But it was never the case that the United States was going to lose that war; it was always a matter of, “How many days?” How many days is it going to take us to win?

Where China Is Now

In the intervening years, China's military has changed both quantitatively and qualitatively. Now they have the largest navy in the world, and those ships are some of the most advanced surface ships that can be comparable to those of the United States. Same with their fighters; they have fifth generation airplanes and the largest airforce in the region. They’ve put all these capabilities online, and at the same time, they [have also] started developing capabilities to reach out and touch the United States with.

They developed the capability to hit moving ships at sea, which is something the United States doesn’t have the capability to do. They have a huge cruise and ballistic missile program that basically can take out a U.S. base like Kadena  in the region in a matter of hours, should they ever be willing to make a direct hit on the U.S.

This doesn't mean that China is more powerful than the United States; China still can’t project power outside the Indo-Pacific region, and even there it’s mostly through space, cyber, and nuclear weapons. But most of the contingencies we're talking about are really close to China, so it doesn’t really matter that they can’t project power. So, on the conventional side, I’m very concerned.

Why Taiwan Matters

The whole goal of the Communist Party, since its founding in 1949, has been to resolve this Taiwan issue.

Now they have the ships, the aircraft, and they’ve reorganized their whole military so that they can do joint operations, so that the navy and the air force can do an invasion of Taiwan. And a lot of those efforts came to a successful conclusion at the end of 2020. And that's why people like myself, not because of  the capabilities, but because when I was in Beijing and talked to the Chinese military and government officials, they said, “We could do this now, and maybe we should think about it.”

We know from behavioral economics that countries and people are much more willing to take risks to not lose something that they think is theirs, versus when they are trying to get something which they don't think is theirs. In the Chinese mindset, Taiwan, the South China Sea, East China Sea, etc. is already theirs, and the United States is trying to take it from them. That makes the situation even more problematic. 

What the United States Should Do

The Biden administration is doing a lot of political maneuvering to show that the United States is willing to defend Taiwan. And I think it’s just upsetting Beijing, because they think we’re changing the political status quo. It also does nothing to enhance our deterrence, because it doesn't signal anything about our capability to defend Taiwan.

The Chinese basically assume the United States will intervene. Their big question is, can they still win? We need to show China that they cannot win, and that’s about showing out capabilities in the region. It’s about aggressively negotiating new host arrangements, more access for the U.S. military, and new international institutions and treaties that constrain the ways China leverages power.

I'm a military person, but I'm totally on board with leading with diplomacy. But I don't see those types of efforts coming out of the Biden administration. They seem to want to double down and do the same things, just with more allies and partners.  I'm supportive of it, but I just don't think it's enough.

In her recent Foreign Affairs essay, The Taiwan Temptation: Why Beijing Might Resort to Force, Center Fellow Oriana Skylar Mastro argues that Chinese leaders now consider a military campaign to take Taiwan a real possibility and cautions that the United States cannot by itself alter Beijing’s calculus on Taiwan. The essay sparked a heated debate. In the September/October issue of Foreign Affairs, several scholars — Rachel Esplin Odell and Eric Heginbotham, Bonny Lin and David Sacks, and Kharis Templeman — provide counterarguments to Mastro's analysis and she responds to their criticism. Read her complete rebuttal below.

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Rachel Esplin Odell and Eric Heginbotham, Bonny Lin and David Sacks, and Kharis Templeman all argue that China is unlikely to attempt armed unification with Taiwan. Although I appreciate their perspectives, they do not present any new evidence that would make me reconsider my assessment that the risk of Chinese aggression across the Taiwan Strait is real and growing. To the contrary, they repeat many of the increasingly dangerous misperceptions that I sought to dispel in my original article—namely, that China does not have the military capabilities to pull off an amphibious invasion, that the economic costs of an invasion would be sufficient to deter Chinese President Xi Jinping, and that China can afford to wait indefinitely to achieve its most important national goal of unification. My critics assume that insofar as there are risks, they can be dealt with through relatively limited adjustments in U.S. policy and military posture — a position with which I still strongly disagree. 

Let’s take these arguments in order. My critics say that I have exaggerated China’s military capabilities and understated the difficulties of an invasion. But their assessments rely on outdated or largely irrelevant comparisons. Odell and Heginbotham, for instance, note that the United States needed more naval tonnage to capture Okinawa from Japan in 1945 than China has today. But this example is inapposite. Japan’s military was more than six million strong in 1945 and had been fighting for over a decade; Taiwan’s military consists of 88,000 personnel and two million reservists, of whom only 300,000 are required to complete even a five-week refresher training course. Tonnage, moreover, is not a useful metric. Modern navies have moved to lighter, more flexible fleets. Odell and Heginbotham point out that civilian ships were of only limited use in the Falklands War, but the United Kingdom used just 62 of them in that campaign. The People’s Armed Forces Maritime Militia has many thousands of ships and is closer to a naval force than a civilian one. If China were to mobilize all its naval vessels, including its new large amphibious transport ships and civilian ships, it could hypothetically carry hundreds of thousands of troops across the 80-mile-wide Taiwan Strait in a short period of time. Even if the United States had enough warning to optimally position its submarines, it does not have enough munitions to target such a large force. 

For their part, Lin and Sacks argue that to believe China can take Taiwan by force is to fall for a Chinese misinformation campaign. They warn that “analysts should not accept at face value China’s claim that it could easily win a fight against Taiwan.” But no one, not even the cockiest of People’s Liberation Army analysts, argues that a full-scale attack on Taiwan would be easy, only that the PLA could prevail at an acceptable cost. Moreover, my assessment of Chinese military capabilities is not based on Chinese discourse or the results of war games alone. Reams of unbiased and rigorous analysis—from the U.S. Department of Defense’s annual report to Congress on China’s military modernization to Congressional Research Service reports on Chinese naval modernization to hundreds of studies by think tanks and defense-affiliated organizations, such as the RAND Corporation—suggest that the PLA has made unparalleled advances in the past two decades and could take on the United States in certain scenarios. Indeed, Heginbotham himself argued in 2017 that “the balance of power between the United States and China may be approaching a series of tipping points, first in contingencies close to the Chinese coast (e.g., Taiwan).” 

I do not mean to suggest that a Chinese invasion would be a cakewalk. Taiwan could get some shots in, but it does not have the ability to defend itself. Luckily, the United States would, I believe, come to Taiwan’s aid and could still prevail in many scenarios. Taiwan is far from a lost cause. But ten years ago, the United States would have prevailed in any scenario. Because there are now some scenarios in which U.S. strategists think the United States could lose, it is not unfathomable to think that Chinese strategists have come to a similar conclusion. 

My critics also argue that economic considerations will deter Beijing. Should China attempt to use force to assert control over Taiwan, the international response would be severe enough to imperil Xi’s ambitious development goals. But as I argued in my original article, Chinese analysts have good reason to think the international response would be weak enough to tolerate. China could even reap economic benefits from controlling Taiwan, whose manufacturers accounted for more than 60 percent of global revenue from semiconductors last year. The United States is heavily reliant on Taiwanese semiconductors. Should China take Taiwan, it could conceivably deprive the United States of this technology and gain an economic and military advantage. 

But economic costs or benefits, while part of Beijing’s calculus, are unlikely to be the determining factor. Xi’s top priority is protecting China’s sovereignty and territorial integrity—as Beijing defines it. China’s Belt and Road Initiative, its militarization of the South China Sea, and its sanctions against countries that offend it, such as Australia or South Korea, all demonstrate that Chinese leaders are willing to subordinate economic considerations to considerations of power and prestige. In a speech marking the 100th anniversary of the Chinese Communist Party in July, Xi warned against foreign attempts to bully or oppress China, declaring that “anyone who dares try to do that will have their heads bashed bloody against the great wall of steel forged by over 1.4 billion Chinese people.” Those words should be taken seriously. 

Finally, my critics argue that China has no need to attempt to forcibly unify with Taiwan. Lin and Sacks think peaceful unification is working; Templeman believes China can wait indefinitely to resolve the issue. I disagree because I think unification is a top priority for the Chinese Communist Party and Taiwan will not give up its autonomy without a fight. 

A Chinese invasion is by no means imminent or inevitable, but Beijing is now seriously considering initiating a conflict to gain political control over Taiwan, whereas in the past the only scenario in which it would have used force was to prevent Taipei from declaring independence. I agree with Templeman that China is unlikely to invade in the next four years (although I think this is largely because China could benefit from more time to prepare, not because it fears U.S. President Joe Biden’s resolve), but his argument that China can wait indefinitely is logically and empirically flawed. As I argued in my original article, Xi has made numerous statements that suggest he wants to achieve unification during his reign. It would be unwise to dismiss these as mere rhetoric, since he has repeatedly voiced his intention to assert control over other territorial claims before doing exactly that — in the South China Sea, by building military infrastructure and conducting naval drills, and in Hong Kong, by imposing a harsh national security law last year.

Templeman argues that if China believes the United States is in decline, then it has every reason to wait on Taiwan. But in the eyes of Chinese strategists, American decline actually hastens the need for action. Power transition theory, which holds that war becomes more likely as the gap between a rising power and an established great power diminishes, is also studied in Beijing. And although U.S. strategists fret that a rising China, dissatisfied with the U.S.-led international order, will become aggressive and start a conflagration, Chinese strategists fear a different pathway to war. They worry that the United States, unable to accept its inevitable decline, will make a dangerous last-ditch effort to hold on to its unrivaled great-power status. By this logic, a declining United States is more dangerous than a stable, ascendant one. 

Lin and Sacks make a different argument for why Beijing does not need to attempt armed unification. They believe that Chinese leaders remain committed to their long-standing approach of limited coercion coupled with economic incentives showcasing the benefits of unification because that strategy is working. As evidence of Beijing’s progress, Lin and Sacks point to polling that shows the majority of people in Taiwan support the status quo, not independence. But it is an enormous leap from not supporting independence to desiring or conceding to unification. As Lin and Sacks themselves acknowledge, China has employed this strategy of limited coercion and economic inducements for decades, but Taiwan is no closer to being a part of mainland China. In a September 2020 poll conducted by National Chengchi University, only six percent of Taiwanese citizens preferred eventual or immediate unification. So although Lin and Sacks are correct that Beijing will likely continue with its carrot-and-stick approach, it will still need to put boots on the ground to gain full political control of Taiwan. 

My critics also raise concerns about some of the policy implications of my argument. Odell and Heginbotham warn against focusing too much on the credibility of the U.S. military threat when it comes to deterrence, rightly highlighting the equal importance of reassurance. They warn that changes in U.S. policy toward Taiwan could convince Beijing that the United States now supports Taiwanese independence — a misperception that could lead to war. But my argument is for a change in posture, not in policy: the United States should develop the force posture and operational plans to deny China its objective in Taiwan and then credibly reveal these new capabilities. It should not make dangerous policy changes that would risk provoking a Chinese military response. Indeed, I have argued elsewhere that even if a war breaks out over Taiwan and the United States wins, Washington should not demand Taiwan’s independence as one of the terms of peace. 

Templeman raises a separate concern: that highlighting the potential costs of defending Taiwan could bolster the case of those advocating that Washington abandon Taipei. If this were a serious worry, I would be the first to shift my work to more private channels. But those calling for the United States to reconsider its commitment to defend Taiwan are still in the minority, and the Biden administration has been clear that it would come to Taiwan’s aid in the event of an invasion.

Moreover, the reaction of the U.S. Department of Defense to the threat posed by China’s growing military power has been not to back down but to ramp up efforts to counter it. From new doctrines that enhance joint capabilities between the U.S. Air Force and the U.S. Navy to base-resilience initiatives to efforts to improve U.S. early warning systems in the region, the Pentagon is firing on all cylinders to ensure it can deter and, if necessary, defeat China in a wide range of conflict scenarios. U.S. Cyber Command, the U.S. Space Force, and the Department of Defense’s Joint Artificial Intelligence Center were all established partly to counter Chinese advantages in those organizations’ respective domains. If Lin and Sacks are correct that China exaggerates its capabilities to try to convince the United States to give up, Beijing has achieved the opposite.   

In the end, all my critics highlight an important truth: the situation across the Taiwan Strait has been relatively stable for 70 years because of the United States. Washington has managed to convince Beijing that armed unification would fail and that China would pay a hefty price for trying. But China is not the same country it was 70 years ago. Its rapid military modernization, spectacular economic ascent, and growing global influence have changed Beijing’s calculus on many issues. It has taken a more assertive approach to international institutions; built one of the world’s largest, most capable militaries; and extended its economic influence deep and far throughout the world. It would be wishful thinking to assume that China has not also changed its thinking on Taiwan.

Indeed, although my critics argue that China is unlikely to invade, they still recommend that Taiwan improve its defenses and that the United States enhance its military posture in the region — not exactly a vote of confidence in Beijing’s restraint. I had hoped to convince skeptics that China is now seriously considering armed unification, but at least our debate has yielded a consensus that more must be done in Taipei and Washington to enhance deterrence across the Taiwan Strait.