The useful tanks are all mothballed, for whatever reason (the best they have, the T80UK, is still out of date compared to the Russian stuff anyway). Both Ukrainian Armoured Brigades are mounted on T-64s of one variety or another. The Ukrainian air force has actually fairly good tech - SU-24s and Mig-29s - but it's tiny. They have about 40 jets or so.
Artillery is nice so long as the enemy doesn't move around too much. Their AT, particularly their ATGMs, are basically too old to be effective against a T-80 or T-90.
You are right about their air defence, though. Their SAM/AAA fleet is crazy good. They have Buks out the ass! The Russians ought to be very worried about air supremacy in case of any conflict, unless they go on a SEAD binge.
I'd be interested to see how long a corps of reservists with AKs could stop a determined tank division.