Kinda depends a bit on how and why the war ends, doesn’t it? Because it’s also possible that it does so only once/because Russia stops being a threat.
Unless it “ends” just so we can get Ukraine War 2 Electric Boogaloo in a few years when they decide otherwise.
Or with the Crimea thing and all, would that be The Ukraine War: Revolutions already?
And in addition to them backfeeding into the grid , they bypass all the fuses and GFCI protections your house might have and effectively require the use of a suicide cord. That part of a plug should never be providing power, only using it.