The United States and the Soviet Union signed numerous arms control treaties to limit the scope, danger, and expense of their competition. Future arms control treaties are possible but unlikely in the present tense geopolitical climate. Check out: 2 Dividend Legends To Hold Forever and Discover "The Next NVIDIA During the Cold War, the superpowers signed a number of arms control agreements that helped build trust and limit the scope of their competition.
US and Russian officials have both described Poseidon as a new category of retaliatory weapon, with a nuclear warhead capable of triggering a radioactive tsunami to render coastal cities uninhabitable. Arms control experts say the weapon breaks most of the traditional nuclear deterrence and classification rules. It is launched from a submarine like a torpedo, but is claimed to be able to loiter as an underwater drone before attacking with its nuclear warhead.