Russia has 'clearly lost its control' over the Black Sea with its navy moving to safer ports, expert says

• Russia's move of its Black Sea Fleet to safer waters signals its waning power there, experts told Insider.
• Ukraine's ability to strike hard at Russia's ships at Sevastopol is a "significant problem" for Russia, an expert said. 
• But Russia can still attack Ukraine from other ports.

Russia's withdrawal of ships from a key Crimean base to safer ports shows it has "clearly lost its control" over the Black Sea in naval and geopolitical terms, a top naval expert told Insider.