Even if the war ended right now, Ukraine has hundreds of thousands of refugees to move and shelter, huge amounts of destroyed infrastructure to repair and work around, most of their army expended, and a lot of civilian losses. They also won't get Crimea back, and they probably can't hold onto the separatist regions either.

Provided that the world continues to rally around Ukraine and gets critical supplies to the population centers they may avoid grievous additional losses, but Ukraine is unavoidably much worse off than it was pre-invasion.