The USSR stopped the extermination of the Vietnamese by the Chinese. China was afraid of the Soviet Union's threat of a nuclear strike against China. But Vietnam lost the war. He lost Hoangsha - Paracel Islands. Similarly, the USSR lost Damansky and not in 2004, when Putin handed over dozens of islands to China, but immediately in 1969. It's just that the USSR managed to stop the further advancement of China.

By the way, what do you think about Alokazia?