1. Damage is done in Russia, now more intent on making sure they never ally with China which is a bigger threat for them -> so they throw Russia a bone
2. Busy stirring up a war in India/Pakistan, to draw China into it, because of course they are...

War, in the public official sense of the word, is only done to commit genocide. Actual war constitutes quietly hitting an enemy on his pressure points. Targeted assassinations, sabotage, Weather Events, ...