Australia will get nuclear-powered submarines. Some see a proliferation threat.

The new AUKUS security partnership led to an immediate diplomatic fallout between France and the United States. But beyond the concerns about NATO and the Western alliance, or questions about great-power competition in the Pacific, some analysts see another worry: Will sharing nuclear submarine propulsion technology with Australia set back the nuclear nonproliferation regime?

What does this deal mean for nonproliferation? Have such transfers of nuclear submarine technology occurred in the past? Here are four things to know.

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