1941 - The Soviet Union signed a five-year neutrality agreement with Japan. Within four years, Joseph Stalin broke the agreement, declaring war against Japan.
The Soviet Union declared war on Japan on August 8, 1945, 4 years and 4 months after the neutrality agreement was signed.
The Soviets played Japan like a cheap fiddle on that one. Prior to the agreement, The Soviets and Japanese were skirmishing along the Manchuko/Soviet border. Both sides were building up their troop levels, and Stalin had Hitler to worry about. He signed that agreement so he could shift his troops. Japan didn't trust Stalin and ended up standing army on the Soviet border who essentially sat out the war out of concern for a Soviet attack that never materialized.
When the Soviets declared war on Japan, the Japanese were already defeated and all the Soviets did was to take over some northern Japanese islands. Japan was tremendously offended by the Soviet skulduggery and essentially called the Soviets "the thief at the fire", which is a term reserved for the lowest form of human life.
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