For Russia it's simply not a good idea to add 2 piss poor regions with crappy industry held together by duck tape to their own crappy industry held together by duck tape.
Been accusing Putler to expand in Ukraine and now you're saying they wont because they dont have a good industry?
I think they will push it if they really invested that much time/money/military in destabilization and rampant annexing.
Or they didnt?..
And if Russia had bad industry, how would more bad industry would hurt them? It would be more logical if they had good industry and didnt want any bad ones.
I dont know for Ukraine industry, but isnt south/east the richest part of the country?
Also if they can take control of more of the black sea coast and landlock Ukraine, bad industry isnt going to matter a lot, those 2 regions you speak of are part of a necessary chain of regions, and also part of where the unrest is strong.