Use of nuclear weapons in wartime.
Truman in WW2 on Japan.
no
The first Soviet nuclear weapon was tested in 1949. They have never used one in combat.
The first one used in combat was called Little Boy.
hittites
No, the hydrogen fusion bomb was not developed until 1952. The first nuclear weapons were developed and used in combat in 1945.
The meaning of the word nuclear weapon, is a weapon that has a nuclear warhead on it.
plutonium + weapon
The first combat use of the atomic bomb was against Hiroshima, Japan on 6 August, 1945. Three days later, on 9 August, the second (and so far last) use of a nuclear weapon in combat was made against Nagasaki, Japan.
Truman
Only two nuclear weapons have been used in combat, both quite primitive designs to the weapons that are deployed today. The weapon with the most quantities in the current active US nuclear stockpile is the W76/Mk-4 warhead.
No. LLNL even tested several Uranium-Hydride bombs in the 1950s. Even though their computer models said the devices should explode, none gave a nuclear yield. One could use the waste from the reactor as a Radiological Weapon, but the reactor itself is not useful as a weapon.