OP should probably ask (but they won't), how can US slow down China's help to Russia's terrible war on Ukraine, or theft of valuable IP in the free world, or increased aggression against Taiwan and Philippines
If anyone actually wanted to do anything about this "terrible war", they wouldn't using peace agreements as a mean to prepare for war. If Ukraine and it's alies knowingly and willingly made a bet with peoples lives and then kept doubling down on "ceasefire is not an option" - it's only their fault for suffering the consequence and absolutely no one (including China) owes anyone any help in saving their face.
Objective reality exists. No one is going to fall in line with US-centric fake moralizing, based to denying agency to everyone except guys under that flag we don't like.
This is such a weirdly common attitude to US competitors in a western bubble, but I can't figure what motivates so many people to act like such sore losers.
No wonder things like BRICS start popping out. People on the receiving end will justly recognize this attitude as evil.