What should they peacekeep? The Russians are not butchering civilians, their goal is to demilitarize the country and replace the government. There will be no attack on peaceful civilians, hopefully. Civil unrest will be solved the way how Russia is solving that. But that could NEVER be prevented by peacekeepers.
Imagine China would send peacekeepers to Canada to peacekeep the policing against the truckers.
And how would peacekeeping ground troops help exactly against very sad and bad such civilian accidents? The Russians are not fucking dumb to kill civilians in purpose.
The causalities you mention are happening due to accidents or sad and bad collateral damage.
Imagine China would send peacekeepers to Canada to peacekeep the policing against the truckers.
No way.