I am writing a Sci fi in space at the moment and the Russians have a battleship they painted white to call it a medical ship even though it was armed with nukes (self defence of course) lol. Russia would not try to resupply Crimea with Grey painted ships. It would be ferries, humanitarian convoys blah blah blah. They could be loaded with troops and tanks inside but they will play violins and point to those nazis killing civilian and humanitarian aid convoys. And some people will actually listen to that.