It appears the Belbek base in the Crimea has been taken by Crimean / Russian forces with no fatalities, and that the other remaining bases manned by the stay-behind Ukrainian military are falling in the same way with minimal or no casualties.
Late yesterday the Belbek base commander expressed his frustration at the lack of clear orders from Kiev - orders that would have allowed him and his command to return to Ukraine peacefully, carrying their small-arms, with military honour intact. There are reports from other bases of the same thing. No commander will abandon his post without orders - and the affair raises the question of exactly what has been instructed by Kiev to their units in the Crimea.
The situation is militarily hopeless. Overt resistance would only cause wholly unnecessary and utterly pointless death and injury.
I suspect that what Kiev wanted to see was dead Ukrainian servicemen. And that to that end they refrained from issuing orders to evacuate the bases - but being devious and dishonest politicians concerned to cover their arses, also refrained from ordering active combat to defend the bases. I think they hoped to see their own men dead in a way that would offer them subsequent deniability.
My thoughts are with the Ukranian forces in Crimea - who as usual I think are being royally buggered by their 'government'.