The difference between 2014 and now is that now Ukraine is able to fight back after the intervening years of preparation. This is their call and their right to decide what's worth what. If they're willing to fight for their territory, then no one else has the right to question that IMO.
If in February Ukrainians had simply looked at their shoes and capitulated, none of this would be happening. The West would've grumbled, but Ukraine would've become a Russian vassal state.
So when discussing compromises and stalemates, all this is worth considering. The Ukrainians know that to cede territory to Russia is suicide, and that includes Crimea and the Donbas. because whether they die fighting or by compromises that merely delay the inevitable, they're still dead.
And it looks like the Ukrainian people have come to a similar conclusion
https://twitter.com/ChristopherJM/status/1529056147679981570?s=20&t=Qg34U18yLF2eEY2zyMnFzQ
Amid foreign chatter about Ukraine making a peace deal or concessions to end Russia’s war against it, this new survey by Kyiv International Institute of Sociology: 82% of Ukrainians say NO territorial concessions should be made; just 10% back some. https://kiis.com.ua/?lang=ukr&cat=r...mEjBiBmJo1Vlz_VIcbbgwqSg45TFt7lxpK38gaRhBsAcs