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.
The US has refrained from using nuclear weapons due to the catastrophic human and environmental consequences associated with their use. Additionally, the world community, including the US, has generally upheld international agreements and norms that seek to prevent the use of nuclear weapons.
no
Russians do not know how to use nuclear weapons
Guns and knives.
so people can use them for tools and food
No.
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.
the US effectively lost the vietnam war.
because US has no other source to kill enemy
so people can use them for tools and food