Ukraine's attacks in Crimea are 'degrading' Russia's Black Sea Fleet, but have not defeated it: ISW

• Russia's Black Sea Fleet has been weakened in Crimea, but not defeated, per a US-based think-tank.
• Many of its vessels are withdrawn, but it's premature to say the fleet is beaten, said the ISW.
• Still, Ukraine's attacks have left the rear of Russia's southern front vulnerable, per the ISW.

Ukraine's campaign of strikes on Russian military assets in Crimea has been "degrading" Moscow's Black Sea Fleet but hasn't defeated it, according to the Institute for the Study of War.

While the Black Sea Fleet has been weakened in its role as a combined arms headquarters, many of its assets can still be used to fight the war, the US-based think tank wrote in a special assessment on Sunday.