The U.S. is first to have nuclear weapons, having nukes since 1945. The Soviet Union followed the U.S. by developing and testing their first nuke in 1949. Both nation started making hydrogen bombs (nukes using nuclear fission to explode) starting in the mid-1950s. Excuse me replying with a question, but were the Atomic bombs dropped on Japan in 1945 Nuclear weapons ? I am assuming they were, but do not know of the differentiation.
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The only country that has ever used nuclear weapons in any war was the US, at the end of WW2.
The United States used the atomic bomb offensively during WWII. That is pretty close to nuclear weapons.
The only country to ever use nuclear weapons in war is the United States with the two bombs they dropped on Japan. No other country has ever actually used a nuclear weapon.
Only the United States has used nuclear weapons in combat, that was the two bombs dropped by B-29s on Japan to end WW2.
No nuclear weapons were used in the korean war