“The US has the same strategic interest in the Black Sea as it does in the Baltic Sea. In others words, no interest at all.”
Are there any other international waters that you would like the United States to cede to the Russians?
The US, of course, has every right to sail in the Baltic Sea and in the Black Sea.
Just as Russia has every right to sail just off the coast of Virginia, and China has every right to sail just off the coast of California.
But I’d rather all of the countries mentioned above not replace “has every right to” with “must”.
US warships may sail freely in the Black Sea under a freedom of the seas claim, but their passage through the Dardanelles is not free, in fact, it is quite restricted by treaty.