Did you actually watch the video? Ukraine didn't "sink" those tankers. It disabled them by targeting the control centers and terrorizing the crews (and also targeted a tugboat). What Sal failed to point out is that these are civilian carriers, not military logistics ships; this was therefore a war crime. This is a good way to further wear on Russia's patience; I predict that if it goes on much longer, it will impel Russia to finally move on Odessa.