We? Do you mean Ukraine? It is their country, not ours.
If we were invaded an alliance of Caribbean countries, would you agree to give them Florida, Texas, Louisiana, Mississippi, Alabama, and Georgia, to stop the killing?
If that alliance of Caribbean countries had taken possession of those states, progress had stalled greatly in taking them back, and it was plausible that the Caribbean countries could take over more if the fighting continues? Yes, probably. (I'm not sure how the Caribbean countries
could pull off such a thing, though--the US outnumbers them 8-to-1 and has a much stronger military. Did this Caribbean alliance get some kind of crazy future technology?)
At this point, the only way I can see Ukraine taking back all of its territory--the apparent goal being insisted on in this topic--is if Russia ends up legitimately unable to keep going and basically collapses, allowing Ukraine to take back the rest of its territory because Russia is simply unable to continue to defend it. This is something that is possible; Russia does seem to be losing troops at a faster rate than Ukraine. However, the problem with this "keep grinding the war out until s
omeone collapses and just can't keep fighting" is (1) that requires
a whole lot more deaths, and (2) Ukraine could be the one to collapse first. Even if Russia is losing soldiers faster, it has more that it can lose. And if Russia manages to be the country left standing at the end of the slugfest, then it gets all of Ukraine.