Seven and a half months after it began, Russian President Vladimir Putin’s war against Ukraine has not gone as the Kremlin had hoped. The Ukrainian military has resisted with skill and tenacity, in recent weeks clawing back territory in the country’s south and east. As the Russian invasion falters, concern has arisen that Putin might turn to nuclear weapons.

The nuclear threat needs to be taken seriously. Russia’s conventional forces appear stymied, the country has a large nuclear arsenal, and Putin thus far seems unwilling to lose or retreat. He has, if anything, doubled down, for example, ordering a mobilization and a sham annexation of Ukrainian territory. Moreover, Putin has made a string of miscalculations in launching and executing his war on Ukraine, and his comments have observers wondering if nuclear could be next. But there are reasons to believe Moscow would not press the nuclear button. Such use would not end the Ukrainian determination to resist. It would alienate countries such as China and India that have tried to remain on the sidelines of this war. Moreover, senior Russian political and military leaders understand that introducing nuclear weapons into the conflict would constitute a step into a murky and potentially disastrous unknown.

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Putin has made thinly veiled threats about using nuclear weapons against those who interfere with Russia’s invasion of Ukraine. The logic of nuclear deterrence suggests that it’s never in the interest of a nuclear power to engage in war with another country possessing nuclear weapons, as that would lead to mutually assured destruction. But preventing nuclear war is not the sole goal of any nuclear power. Putin might well believe that a world without Russia in its rightful position of power is not worth existing. We can’t be sure of what Putin is thinking, or whether his decision making is compromised – all we can do is prepare for the possibility of Russia’s use of nuclear weapons, writes Herbert Lin.

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The 10^th Nuclear Non-Proliferation Treaty (NPT) Review Conference—a meeting normally held every five years—was intended to celebrate the cornerstone treaty’s 50^th year. But United Nations officials postponed the April 2020 event due to the onset of the COVID-19 pandemic. Then, as coronavirus cases rose in October 2020, the United Nations delayed the conference again, setting August 2021 as the new target date. Enter the delta variant, which pushed the gathering back to January 2022. When the omicron variant emerged in late 2021, the NPT member states set a new target date for some time between August and September 2022.

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This summer, China conducted a series of tests with nuclear-capable hypersonic weapons systems that have clearly gotten the attention of officials across the U.S. government. The tests included a hypersonic glide vehicle — a delivery mechanism that can maneuver through the Earth’s atmosphere towards its target — and also incorporated a fractional orbital bombardment system. Because a fractional orbital bombardment system can deliver its payload by entering into lower orbit and then “dropping” it on the target, it could reach the U.S. homeland via the South Pole, bypassing U.S. early warning systems and missile defenses, which are primarily geared towards the interception of ballistic missiles from the north.

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Emerging and disruptive technologies spell an uncertain future for second-strike retaliatory forces. New sensors and big data analysis may render mobile missiles and submarines vulnerable to detection. I call this development the “standstill conundrum”: States will no longer be able to assure a nuclear response should they be hit by a nuclear first strike. If the nuclear weapons states can manage this vulnerability, however, they might be able to escape its worst effects. “Managing” could mean shoring up nuclear deterrence; it could mean focusing more on defenses; or it could mean negotiating to ensure continued viability of second-strike deterrent forces.

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What we know for sure is that North Korea can build the bomb because the tremors from deep inside the Punggye-ri nuclear test-site tunnels have been detected around the world six times. The most recent blast in September 2017 was more than 10 times the size of the Hiroshima and Nagasaki nuclear explosions. With these explosions, North Korea joined seven other countries known to have detonated nuclear devices.

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Thirty years after the end of the Cold War, nuclear weapons pose a far greater threat to the safety and security of Americans than is reflected in our public discourse. While the United States must maintain a strong nuclear deterrent as an important tool of U.S. foreign and defense policy, an oversized global arsenal of nuclear weapons makes Americans equally unsafe. It is time to reinvigorate arms control discussions to seek reasonable reductions that will make us all more secure.

Too many nuclear weapons increase the risk of theft by terrorists or other nefarious actors, encourage more countries to develop nuclear arms, and raise the risk of nuclear war. Reasonable arms control measures, taken in conjunction with adversaries like Russia, make Americans safer by diminishing the large Russian nuclear arsenal, reinforcing norms against the development and use of nuclear arms, securing or eliminating nuclear material from theft or misuse by terrorists, and saving money that can be used to strengthen the United States military’s conventional deterrence against costly and destructive wars. 

In order to achieve those goals, Washington and Moscow have cut their strategic nuclear weapons since the height of the Cold War. Through the 2010 New Strategic Arms Reduction Treaty, or New START, which the U.S. and Russia recently extended, both countries each reduced their nuclear arsenals to no more than 1,550 deployed strategic warheads arming no more than 700 deployed strategic ballistic missiles and bombers.

Yet, despite these historic cuts, the United States and Russia each still have far more nuclear weapons than either side could conceivably use in a conflict, and at least ten times more weapons than any other country in the world. This actually makes Americans less safe, rather than the other way around.

In 2013, the Joint Chiefs of Staff concluded that the United States could safely reduce the number of deployed strategic warheads by one-third. The Biden administration should use that study—along with the current Nuclear Posture Review– to set the United States on the path to reasonable reductions. 

The Biden administration should aim for new negotiations between the United States and Russian to limit each country’s armed forces to 1,000 deployed strategic warheads. The agreement can be executed incrementally, and the sides might informally agree once negotiations began to deploy no more than 1,400 strategic warheads, as an early confidence-building measure. This first step is an easy and safe one to take, as there have been times over the past decade when both countries already deployed fewer than 1,400 strategic warheads.

As part of a bold new vision for arms control and strategic stability, U.S. negotiators should seek an agreement that encompasses all U.S. and Russian nuclear warheads, including reserve (non-deployed) strategic warheads, and non-strategic nuclear weapons. Negotiators should work to limit all nuclear warheads to no more than 2,500 each, with an embedded sub-limit of 1,000 deployed strategic warheads within the overall aggregate limit. Even with the dramatic arsenal reductions outlined here, the United States would maintain the ability to deter and, if necessary, defend against any global adversary.

Such a nuclear arms reduction agreement would have significant additional advantages for the United States:

First, it could position Washington and Moscow to press China to freeze or limit its build-up of nuclear arms as long as the United States and Russia are reducing their nuclear arsenals. 

Second, such an agreement could give the Pentagon additional resources to support wider force modernization requirements for nuclear and conventional forces alike, including new ballistic missile submarines and the B-21 bomber. If we have the forces to deter conventional conflict, we dramatically reduce the prospect of nuclear war.

Third, such an agreement would bolster America’s non-proliferation credentials and leadership. A new U.S.-Russia nuclear arms reductions treaty may not lead North Korea to abandon its nuclear program overnight, but it would increase the ability of U.S. diplomats to urge third countries to pressure and sanction outliers such as North Korea.

Right-sizing U.S. and global nuclear arsenals strengthens deterrence, reduces proliferation risks, and lowers the threat of nuclear war to the United States and our allies. The Biden administration has an opportunity to reduce that risk. It should seize it.

Rep. Ami Bera, D-Calif., is chairman of the House Foreign Affairs Subcommittee on Asia, the Pacific, Central Asia, and Nonproliferation. Steven Pifer is a William J. Perry Research Fellow at Stanford's Center for International Security and Cooperation.

Originally for Defense One