That's the Ukrainians goal and the EUs too I figure, there is undeveloped oil and gas in Crimea and offshore outside Odessa and oil and gas in the east too. In fact there is enough gas to supply Europe for a decade, most of it undeveloped. It is also the biggest source of Helium as a byproduct apparently. Ukraine wants it's turf, but it also needs long term security for prosperity and stability, the way to ensure that is to destroy as much of Vlad's army as they can, kick him in the nuts as hard as they can on the way out the door.
This will also lower future defense costs for NATO and America and allow America to shift focus to China, as they already have announced. They wouldn't do this unless they figured Ukraine was in the bag and Vlad will be fucked for good. We will only need a token force in Europe after this shit, the Germans are going strong and NATO will have two very powerful new members. The myth of the mighty red army has been shattered, along with their invincibility and this will have implications in other former soviet republics, they smell weakness. Ukraine is a powerful example for them, an inspiration and potential ally, also courage is highly contagious, it can spread quickly and is fueled by hope.