Park a couple Los Angeles Class SSN’s and Ohio Class SSBN/SSGN’s in the area...
Why in God's name would you park a ballistic missile submarine in the Black Sea?!
Isn’t that a self-answering question? Nothing says, “I mean business” like 24 Trident missiles. Is that message wise? No.
Yikes. There are a bunch of reasons. Probably the one that will get the most push back (sadly) is yeah, it'll send a message, one of nuclear war, way unnecessarily. But let's move on...
These things shoot missiles with intercontinental range... They don't need to be 20 nm from Russia to effectively use. They deploy to, uh, wherever they go, somewhere super duper secluded, because they have the range. You wouldn't build an ICBM silo in an allied country right next to the border of Russia for a myriad of reasons, one being that again, they have the range to go around the world, why go through all the cons of having it right up Russia's ass? Short/medium range nuclear weapons are another story with their own problems, but we aren't talking about those.
But probably the most important reason is the acoustics of these subs are super top secret, again, for obvious reasons. There is absolutely no reason
to deploy these subs where they could easily be picked up.
So in all, you'd be sending nuclear missile equipped subs right next to Russia's doorstep, needlessly and wrecklessly pushing us closer to the brink of an accidental nuclear war (well beyond "sending a message"), giving Putin the opportunity to look like the good guy, having the heightened chance of any unknown missile launch in this region viewed as a nuclear launch (with a lot less time for reaction which raises the possibility of a nuclear counterstrike, a huge reason why short/medium range nuclear weapons were banned in the first place), having our closely guarded subs transit through 3 choke points (Gibraltar, Bosphorus, and Dardanelles) and sit in a relatively small sea waiting to be tracked and acoustic signatures recorded, all so we can launch nuclear missiles in harm's way instead of some unknown random point in the middle of no where half a world away from Russia.
Guess it doesn't matter my thoughts on it because the odds of such a move getting signed off is less than the odds than Boeing restarting the 757 line the day Southwest orders 500 A380s