Ukraine is in a race for time. Before the end of February, Ukraine needs to fill as many body bags as possible with Russian soldiers to be sent home to their mothers, wives, children, and fathers. Ukraine also needs to hope that economic sanctions, when combined with filled body bags will break the spirit of most Russians for any further war effort before the end of February.
If that doesn't happen, then after the end of February (when Russia initially attacked because they felt weather would be good enough for a short war) the war will become an even bigger battle of attrition until one side or the other can no longer stomach the costs of war.
For Ukraine the best thing that could happen would probably be a no-fly zone established in March of 2023. Russia is just so much bigger that as long as it is a war of attrition, Ukraine is at a disadvantage. If for no other reason that the EU will get tired of supporting Ukraine.
Who would you suggest establish the no fly zone?