China sent troops to help North Korea during the Korean War, significantly influencing the conflict's dynamics. The Soviet Union provided support in other forms, but it did not deploy troops. Thus, the correct answer is China. ;
China sent troops to help North Korea during the Korean War, which occurred from 1950 to 1953. Their involvement was significant in reversing the fortunes of North Korean forces against UN troops led by the United States. While the Soviet Union provided material support, it did not deploy troops in the conflict.
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