Specs, etc., for the Ochakov:
http://flot.sevastopol.info/eng/ship/largeaswdestroyers/ochakov.htm
569 ft. long - not exactly a rowboat.
I wonder if the Ukrainians were going to try to break out and the Russkies got wind of it.
Can’t wait for Putin’s explanation...
Does this qualify as an act of war?
Yes. A blockade is an "act of war" -- whether passive (as in this case) or active.
But I think we're well past that...