The Russians knew nothing about the Manhattan project and if they did they would have tried to develop a nuclear weapon before the US did.
If Russia, Afghanistan or any country tries to attack us we can use a nuclear weapon and send them back home. The countries with nuclear weapons won't attack us with those weapons because they know that if they attack with them, we will attack them back ans nobody wants to be attacked.
At this time Russia.
USSR
Probabaly Iran launching a nuclear warhead at us because of the "you-should-be-more-like-us" harassment, the missile supplied by their friend, Russia, leading to nuclear war followed by nuclear winter, and the human race dies out.(hope the nuke is their most powerful non-nuclear weapon in their arsenal instead.)
Nobody, the US was the first country to work out how to actually make nuclear weapons.
Yes it can. The distance from Russia to the U.S is 9000km, r-36 Russian missile could travel 16000km in 30mins(and it is a 1967 one).
The US performed the first nuclear weapon test on July 16, 1945.
America has roughly 10000 nuclear warheads and russia has anywhere from 5200-8800
End of WW2.
never, most of their nuclear weapon activity was for propaganda purposes.
Russians do not know how to use nuclear weapons