It will never be lasting peace, everyone knows that. Putin took Crimea and then there was peace, now he takes parts of Ukraine and there is peace, next up he'll take even more... he won't stop. This is why the EU keeps siding with Ukraine on this, they know if they don't stop him in Ukraine, he will invade the EU at one point.
He wants the war to end, cutting aid without getting an agreement on peace from Ukraine/Europe is just going to make Ukraine have more casualties or Europe send more aid. That won't accomplish anything... though a nice cost saving initiative I guess.