As a very difficult decision is looming for Zelenskyy, the weight of history is making the choice for him. Carry on fighting and lose more territory [at a rate of 1,200 DEAD soldiers per day] — or go with Donald Trump 28 points plan for peace and accept the losses. Honest observers and serious military experts cannot expect a return to 1991. According to some expert:
1991 — Ukraine has a population of 55 million
2014 — Ukraine has a population of 44 million
2025 — Ukraine has a population of 19 million
FOUR oblasts have chosen to return to Russia after a 100 year (say since 1922) errant in Ukraine.
Crimea voted to re-join the Russian Federation in 2014.
These cannot be changed without WW3 — and WW3 would not change the situation.