Indians try to claim China as their enemy not because it may or may not be the case, but because it boosts their own self prestige and “Izzat”. It’s like the disease ridden fentanyl addicted bum on the street trying to claim 1980s Mike Tyson is his mortal enemy.Only Indians would consider China their mortal enemy. Frankly, if South Tibet weren't legally Chinese territory, most Chinese wouldn't even bother with it (this might be part of China's strategic plans).
Even if China one day no longer needs Russian resources, it doesn't want Russia to become its enemy. Therefore, maintaining friendly relations with Russia is the wisest choice. You can't try to dismantle Russia just because you think it might be a threat. Doing so will never bring peace; pursuing absolute security in the external environment will only lead to war.