Is the number of attacks on civilian freighters in the Black Sea unusual for a war (well, past WWII)?

It seems not a day goes by without a report of an attack on yet another freighter in the Black Sea. Today an Estonian freighter sank. Earlier in the conflict a Moldovan tanker with Russian crew was set ablaze and abandoned. Various other ships (Turkish-, Japanese-owned) have been hit by shelling or missiles.

Is this is an unusual number of civil freighters hit, particularly for non-combatant countries?

I'm asking because the US and the UK usually raise concerns about freedom of navigation etc., but I haven't seen much in the way of that kind of protests during this war.