Sure, but Ukraine is not getting Crimea back. They can ensure that they don't cede sovereignty to Russia by insisting without any reasonable pathway that they want to join NATO and the EU. US was already bitching about NATO members not paying their due share and the EU doesn't want another Eastern European dependent state while simultaneously dealing with with Hungary and Poland. This is an easy concession to make and they are only dragging their feet on this because Russia made it a demand. Russia on the other hand has a good reason to draw that line in the sand, because it has a strong hand, being a major supplier of energy to Western Europe and Putin cannot survive domestically while being dicked around by the US like he is North Korea.