The stamp was issued to commemorate the defiance of Ukrainian troops on Snake Island. When the Russians told them to surrender they replied, "Russian warship XXXX you!" This occurred a few weeks ago. The "Moskva" sank yesterday.
I just ordered one each of the two different sheetlets from a Ukrainian philatelic retailer. I'll report when they arrive, if they do…the site calls the stamp a special order, and I'd guess I'm in line with a thousand others.