Russia needs the money too, their economy is struggling, but Putin does not want to stop attacking Ukraine. It's only fair that Ukraine does what it takes to keep Russia at a distance. Ukraine has absolutely no choice but to fight back. I understand Putin does not want to go home without a prize but if he had stopped the war 2 years ago Russia would now be in a much stronger position, selling oil at a very nice profit. If the war keeps on going on Ukraine may actually win the war and Russia could completely collapse.