You'd have to be specific as to when, and how broad you're being when you say "weapons". Since this is classed under "Japan in WW2", I'll go with that, and say that some of the weapons included:
That should cover firearms.
Although US agreed several arms agreements banning use of nuclear weapons, USA DOES use nuclear weapons and in fact, US is the ONLY nation to have used nuclear weapons in war.
no
Russians do not know how to use nuclear weapons
No.
Guns and knives.
so people can use them for tools and food
the u.s. used non nuclear weapons and nuclear weapons against japan
The U.S used no nuclear weapons whatsoever on Vietnam.
Different types of Eldar use different weapons - buy the codex and find out which ones are which for yourself, like the rest of us do.
so people can use them for tools and food
the US effectively lost the vietnam war.
because US has no other source to kill enemy