It was a terrifyingly close call:

Liu Chenshan, the author of a series of articles that chronicle the five times China has faced a nuclear threat since 1949, wrote that the most serious threat came in 1969 at the height of a bitter border dispute between Moscow and Beijing that left more than one thousand people dead on both sides.

He said Soviet diplomats warned Washington of Moscow's plans "to wipe out the Chinese threat and get rid of this modern adventurer," with a nuclear strike, asking the US to remain neutral. But, he says, Washington told Moscow the United States would not stand idly by but launch its own nuclear attack against the Soviet Union if it attacked China, loosing nuclear missiles at 130 Soviet cities. The threat worked, he added, and made Moscow think twice, while forcing the two countries to regulate their border dispute at the negotiating table.

Just in case you were feeling complacent about North Korea.

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