Oh.
You're Russian?
No other nation contributed significantly to the defeat of Japan. The Soviet Union? No. The UK? They were still retreating in Burma well into 1944. The Chinese? The Japanese were still advancing wherever they pleased well into 1945.
The Dutch, the French? Hardly.
The Australians? Fought bravely in New Guinea. Zero significant impact.
The US ALONE brought down the Japanese.
You're welcome.