“The Russian Black (Sea) Fleet is also going nowhere. In fact is expanding.”
Unless Russia is building new warships in the Black Sea then no, the Black Sea Fleet is not expanding. Per the Montreux Convention the government of Turkey has closed the Bosporus to all transit by warships. This means there are no reinforcements going to the Black Sea for Russia.
In fact two Russian warships had waited nine months trying to gain passage to the Black Sea when they finally gave up and apparently headed for Vladivostok.
The Russian Black Sea fleet is therefore not expanding.
Do you not realize the Russians can and are building new and refurbishing older ships in their territory inside the Black Sea littoral?
New Azov Sea fleet organization planned for Mariupol
https://news.yahoo.com/russia-creates-affiliate-black-sea-121001166.html?fr=sycsrp_catchall
https://news.yahoo.com/russia-bolsters-azov-sea-flotilla-185700402.html?fr=sycsrp_catchall
Ukraine: Russia increases combat ready warships in Black Sea, adds 2 Kaliber carriers
They can move newly commissioned or transferred ships into the Black Sea through rivers and canals, recently saw an article about the logistics but cannot remember where