facebook.com/Andriy Klymenko

A warship of Russia's Northern fleet entered the Black Sea on Wednesday, January 9.

The vessel in question is the Severomorsk (619) anti-submarine Udaloy-class destroyer, according to Andriy Klymenko, an expert with the Ukraine-based Maidan of Foreign Affairs Foundation.

"For the first time since the start of Crimea occupation, a warship of the Russian Northern fleet – not just a landing ship of another fleet but the one that is part of the Russian navy's main strike force – has entered the Black Sea waters," the expert wrote on Facebook, also posting the relevant photos of the destroyer.

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As was earlier reported, the landing ship of the 6th U.S. Navy fleet, namely USS Fort McHenry (LSD 43) entered the Black Sea via the Bosphorus Strait.

Ex-U.S. Ambassador to Ukraine John Herbst earlier called weak the Western response to Russia's November 25 attack on Ukrainian naval boats, suggesting this would give Putin a green light for further escalation.

The diplomat suggested that the U.S. provide Ukraine with a number of specific weapons to bolster its coastline defenses against Russian aggression.