Russia
Fear that the North Vietnamese would obtain nuclear weapons themselves (from Russia or China) and use them on South Vietnam or even on America.
Israel, America, Russia, China... that's all i can think of on the top of my head. Others that are "internationally allowed" to have nuclear weapons (approved by IAEA) would be France, and England, that I know of. I do not believe Israel is on that list.
Project 'Manhattan' or to simply say, Nuclear Bombs and the US "Red Scare" in the early 1950s. from then on every country wanted nuclear weapons, And the First to acquire was the US, then Russia, then the United Kingdom, then France, then China, then India, then Pakistan, then North Korea. It is believed that Israel also has them, but they refuse to either confirm or deny. At the peak of the cold war arms race both the US and Russia had more than 10,000 strategic nuclear weapons and roughly 50,000 tactical nuclear weapons each, no other country in the world has ever had more than a few hundred total strategic and tactical nuclear weapons. As of 2014 both the US and Russia have reduced their stockpiles to about 3000 strategic nuclear weapons and zero tactical nuclear weapons (however the US maintains the parts from the dismantled 7000 strategic nuclear weapons and in an emergency could still reassemble them in a few months time into usable weapons, Russia likely has similar ability).
Known nuclear states: The United States of America Russia China The United Kingdom France India Pakistan North Korea Unconfirmed nuclear states: Israel
Number of nuclear weapons by country: Country # of nuclear weapons USA 10'300 Russia 16'000 China 410 France 350
According to my research the most weapons country is the United States currently owns 9,600 nuclear weapons, while Russia currently owns 16,800. But Russia actually always had more nuclear weapons than the United States.
The two main nuclear powers are Russia & US by at least an order of magnitude above other countries. Russia currently has slightly more weapons.
America, Russia, and Korea.
From 1945 until the late 1970s or early 1980s the United States always had the most nuclear weapons. After then the USSR/Russia has had the most nuclear weapons.
No, Russia has more than the US.
Russia
absolutely
Russians do not know how to use nuclear weapons
Fear that the North Vietnamese would obtain nuclear weapons themselves (from Russia or China) and use them on South Vietnam or even on America.
For survival.
They lost them.