Mysterious voyage: Russian corvette dodges limits, surfaces in Caspian Sea

"The Montreux Convention limits Russia's movement of warships through the Turkish Straits. Despite this, a Russian corvette from Project 22800 vanished from the Black Sea. Surprisingly, the ship Tucza reappeared in an entirely different body of water. How did this happen?

Until recently, the Russian missile corvette Tucza, a Karakurt-class (project 22800) ship, was docked at the port of Novorossiysk and other vessels. Satellite imagery revealed that the Karakurt-class corvette, corvette Tucza, vanished from the port of Novorossiysk, its previous station. Though the ship did not traverse the Dardanelles—blocked in wartime scenarios by the Montreux Convention—it emerged in the Caspian Sea, an entirely different body of water..... the Russians opted to transfer their ship through inland waters. The small size and draught of the karakurts enable them to navigate not just at sea but also along sizable rivers.
The Russians have previously utilized this approach, routinely transferring small units between their five fleets using inland waterways. Tucza's transfer from the Black Sea showcases how relocating naval ships through a network of rivers and canals, usually practiced in peacetime, is also viable under wartime conditions." MS