On November 25th (two days before this writing), a Russian cargo ship blocked three Ukraine cargo vessels from traveling through the Kerch Strait, a narrow body of water between Russian-controlled Crimea and the Ukraine mainland. When the three Ukraine vessels turned to depart, they were seized by the Russian navy.
At least one pundit claims the Russians are maneuvering to secure the Ukraine ports of Mariupul and Odessa, a key step in retaking the rest of Ukraine mainland. See some details regarding controlling ports and sea lanes here.
“Not happy,” is an inadequate response. Presumably the United States navy has some expertise regarding protecting port cities such as Mariupul and Odessa.