Anonymous source. Great.
Ukraine’s military was looted for years by Russian puppets so of course its like a 3rd world country force.
I've been saying that too, but as I think about it, I believe there's even more to it. Ukraine's military was heavily infiltrated by Russia, and I'm pretty much willing to bet that any purges that were done were not nearly thorough enough, because, of course, the political leadership is NOT a bunch of disciplined ultra-nationalist Nazis, it is (mostly) a bunch of corrupted businessmen. Anyone not wishing to be purged simply had to come up with a little money, most likely.
Take roughly equal parts incompetent (to the task) leaders, moles and subversives, fresh recruits, some decent troops (they have won SOME battles, after all), weapons that are likely to blow up in one's face or just not work at all, and a West either weak or desirous of a bloody drawn out conflict, or both, and stir well...
Russia on the other hand is sending in relatively modern / competent arms, and men with (especially after the airliner downing) a competent and uncompromised (for the most part) command structure.