Nobody who has even a modicum of understanding of geopolitics doubts this. India and Russia have a very strong relationship that goes back to the days of USSR which was one of the biggest forces that helped liberate India from western colonization. Meanwhile, Russia losing the war would be an utter disaster for China. US is very openly trying to surround China militarily, and Russia acts as a shield in the west. The worst possible outcome for China would be the west managing to destabilize Russia and put a pro western government in power. If there was even the slightest chance that Russia could lose this conflict then China would step in.