always the navy the first one to crumble during war..
well, Ukraine's navy ships are few, all obsolete and ancient..so they wouldn't put much of a fight anyway..
that leaves the air force and the army
both branch are strong, Ukraine's Air Force will be a serious problem for Russia and Crimea..
Russia will have a hard time trying to obtain air superiority over Ukraine..
Ukraine's Air Force seems sturdy with their 48 Hinds, hundreds of Mig-29, 36 Frogfoot, 16 Flanker...
but i think maybe half of the air force will also defect to Russia/Crimea..
i think we can see a lot of defections in this conflict

As a PMC they're employed by the Interior Ministry (i/e the government),so i guess some of their heavy equipment is loaned out by the government. From my research,these guys are a PMC group created but not part of the government called Vnevedomstvenaya Okhrana (Private Security Section). Probably created just for these kinds of situations where the Russians need to take direct military action but still have that deniability factor (no matter how thin the disguise are,c'mon everybody knows these guys are russians.....)

A convoy of BTR wheeled APCs on the move
No magazines? maybe for now only has orders to act only as non-combat troops. It's like "we're not here for a fight,see we don't even have ammo in our rifles but we are prepared,if you screw around with us;we'll start loading ammo & all bets are off".

A squad of unidentified soldiers deploying for maneuvers

Very well-armed & equipped soldiers in unmarked uniforms patrol the area near a Ukrainian military outpost

Spetsnaz Special: The Legendary Kalashnikov


Russian Spetsnaz Army FSB ФСБ Centre 2013 Documentary