If you mean what happened to them at the end of WW2 then they were invaded by America (USA) and the USA dropped an atomic bomb on them as a symbol of strength to scare the Japanese and force them to surrender in which they succeeded.
The US occupied Japan after dropping the atomic bomb, but it never invaded Japan. The reason for dropping the A-Bomb was to prevent the need to invade.
Nagasaki, Japan
The United States wasn't at war with Japan in WW1.
Soviet Union
Soviet Union
Are you serious? The USA!
Nuclear fission
Soviet Union
Soviet Union
To end the war and to collapse Japan's means to make war.
japan went into a neutral state of living after the war
The Japanese Instrument of Surrender was the written agreement that enabled the Surrender of Japan, ending World War II.
Germany, Japan.