Ships somehow managing to crash into each other at sea is always amazing to me. Two biggest causes are improper or lack of watchkeeping, and improper respect to right of way. COLREGS state that all things being equal, the less maneuverable ship has the right of way. And also that a visual, eyeball watch must always be maintained. The tanker clearly had the right of way, best I can figure. I don't understand, from the info we've got, why (unless there is some sort of military reason) the tanker would be maneuvering to yield right of way to the destroyer. The tanker would be the stand-on vessel, the destroyer the give-way vessel. Because that destroyer could run rings around the tanker effortlessly.
None of this makes any sense.