> Change their flag to the Ukrainian one (or the UN or whatever else) Ships don't fly flags to signal patriotism or some other virtue. They fly the civil ensig

> Change their flag to the Ukrainian one (or the UN or whatever else) Ships don't fly flags to signal patriotism or some other virtue. They fly the civil ensigns of the country where they are registered as a matter of international law. Good luck trying to register a Russian owned ship in Ukraine in the present circumstances.