Playing for Time?

Why isn't playing for time in Ukraine's interest? A lot folks seem to think the ceasefire helps Russia regroup and regather. For what? Another invasion? A subversion of the democratic process? If the Ukrainians can keep 80% of their land and a legal claim on the 20% of their lost territory, I say regroup for 10 years down the line when Putin and Xi are both in their 80s. Good luck on the transition of power if those places. You think US elections are hectic - imagine the chaos in China and Russia...