Schadenfroh
Elite Member
Not a full scale war, but they had border conflicts. The Soviet Union was tempted to invade China after China attacked their ally Vietnam, but the main deterrent for that would have been the massive amount of troops that the Chinese stationed on the Sino-Soviet border.China and Russia have gone to war and I believe they both had nukes at the time (although I could be wrong).
http://en.wikipedia.org/wiki/Sino-Soviet_border_conflict
On March 2, 1969, a group of Chinese troops ambushed Soviet border guards on Zhenbao Island. The Soviets suffered 58 dead, including a senior colonel, and 94 wounded. They retaliated on March 15 by bombarding Chinese troop concentrations on the Chinese bank of the Ussuri and by storming Zhenbao Island.
Further border clashes occurred in August 1969, this time along the western section of the Sino-Soviet border in Xinjiang. The Chinese suffered additional casualties in this engagement. Heightened tensions raised the prospect of a nuclear war between China and the Soviet Union.
http://en.wikipedia.org/wiki/Zhenbao_Island
It was the subject of a territorial dispute between the Soviet Union and the PRC. Battles were fought over Zhenbao Island by the Soviet Union and the PRC, with a considerable loss of life, during the Sino-Soviet border conflict of March 1969. The conflict over Zhenbao raised concerns that it could ignite another World War until an initial resolution of the conflict in November, 1969.
http://en.wikipedia.org/wiki/Sino-Vietnamese_War#Sino.E2.80.93Soviet_split
China also achieved another strategic objective of demonstrating to its Cold War foe, the Soviet Union, that they were unable to protect their Vietnamese ally. As many as 1.5 million Chinese troops were stationed along China's borders with the USSR and were prepared for a full-scale war against the USSR.