Janes is reporting Ukraine's navy is now facing an existential crisis with the bulk of their command structure and 12k of the total 15k personnel have been captured, surrendered or defected to Russia after being surrounded in the bases, boxed into the lake, not receiving proper orders from Kiev and not allowed to leave over the past few weeks. Almost the entirety of their naval warships have also been captured.
http://www.janes.com/article/35861/u...ve-into-crimea