I'm writing a story, and wanted to know how possible this was. In 1969, members of the People's Liberation Army ambushed a Soviet patrol, leaving 59 dead. Eventually, the conflict expanded to Zhenbao Island, which basically was a mini war for an island. The reason for the conflict was because the old borders drawn between tsarist Russia and China resulted in the annexation of Chinese territory, but the USSR refused to change it. This caused the above conflict, which gradually diffused, but could've changed the Cold War completely. The USSR started looking at the idea of a US/USSR joint attack on Chinese nuclear weapon depots. So what if that happened, or there was an all-out nuclear war between the USSR and PRC instead of with the US? How would've it affected history?