Have you ever thought about what Russia's influence in the AI sector would be by now if they would have focused on developing it instead of starting a war? Developing it while pretending a peaceful cooperation with the West?
It might well be that China supports Russia's war effort so much because it knows that this way Russians will have zero time and resouces to focus on being an AI leader, and through it, a threat to China.
The biggest win for the US and China is that Russia will now never be at the cutting edge in AI development. The longer this war goes on, the better it will be for both the US and for China.
Even Europe will be more advanced than Russia during the next couple of decades.