When is the end of the war? What's to pull?
The end is when one side has no means to continue. People in the West tend to compare this
with Afghanistan, but Cuba is better comparison. Since Russia declared Ukraine in NATO as existential threat,
similar as USA declared nukes on Cuba, they will put their whole weight into war, so it will last
as long the West, or Ukraine, are willing to continue
This ends up with a militarised border like SK and NK. There is no doubt that the moment Ruzzia thinks they have a good chance of grabbing another chunk of land they will and there is no doubt Europe would rather have a free business ready Ukraine that can deal with the ugly girl in the party.
BTW there are clear signs of a massive debt all across Ruzzia. Private companies have been forced to pay for the war with their balances to avoid a full collapse of the state finances but that has a very short run. Ruzzia is now hoping that Trump gets there and saves them from becoming an economically failed nation - and he probably will, for a price.