What does the Australian submarine deal mean for non-proliferation?

Only once in its history has America handed over a nuclear submarine propulsion plant, the crown jewels of military technology, to another country. That was 63 years ago when America helped the Royal Navy to go nuclear. Now it will take that dramatic step again. A new trilateral defence pact, AUKUS, announced on September 15th, will involve far-reaching defence co-operation between America, Australia and Britain. The group’s first initiative, and its most important, will be American and British assistance to Australia in building a fleet of at least eight nuclear-powered submarines. The precise form of assistance will be worked out over the next 18 months; it may involve Britain actually supplying the technology, with America’s blessing and support.