I'll believe it when I see it. And I mean see proper leaving, not the current "Oh we're not even there, pls ignore using nato airfields for attacks, supplying intelligence, directly providing orders and weapons control, and merce- I mean volunteers totally unaffiliated with the military and totally not currently employed!"
Besides, it would just mean the main goals have been achieved - Ukraine is in ruins, the bad blood between Ukraine and Russia will now run for generations to come, Europe is frothing at the mouth and seeking to either enter a direct war with Russia, or at least cut economic ties, etc.