I don’t think the Ukes should surrender their country. If the Russians were insisting on unconditional surrender or insisting that all of Ukraine be absorbed into Russia then I’d say by all means fight bitterly even if you are badly outgunned.
On the other hand, those are not the terms that have been offered to them by the Russians. What they’ve insisted on is:
1) let the Russian dominated regions of Ukraine go
2) get rid of the Nazis like the Azov Battalion
3) be neutral. Not in the EU or NATO but otherwise, just like Finland or Austria, do as you wish so long as you are not openly hostile to Russia.
Are those terms so onerous that the Ukes should be willing to endure a bloodbath to prevent them? They’re not in the EU or NATO now. They’d give up nothing there. Is it so important to control areas dominated by Russian speaking ethnic Russians who don’t want to be ruled by Kiev? As for the Nazis, I’d be just fine with the Russkies ridding us all of them.
You conveniently forgot Putin's demand that Ukraine demilitarize: no army larger than 60,000
with no NATO umbrella and no army it's an unconditional surrender, with no defence for future Russian invasions