The total strength of the Ukrainian Armed Forces was less than 160,000 in 2014. Out of that somewhere between 20,000 and 25,000 were naval personnel. A majority of the naval personnel defected to Russia, and most of the remainder retired when Crimea became a part of Russia. Now talking about the ground forces, there were around 75,000 of them in 2014. Somewhere between 20,000 and 25,000 were killed in the fighting and many tens of thousands were wounded. So it is safe to assume that right now, Ukraine has no military to speak of.
Hence Der Volkssturm of Pornoshenko and Ukraine´s Himmler wannabes.
Anyway, it isn´t so much about size as good training, leadership and motivation. I doubt that this joke of military has many decent officers by now, not least after nazis and other fruitcakes in power started appointing generals and they then picked staff of the same ilk. Like the Russians say a fish rots from the head down.