Well, even if they don't plan STOVL now, that may change- a lot can happen in the next 40-50 years! Some here advocated using F-35 STOVL on our CVNs!Please let us confine ourselves to reality, not fantasies. The Yak-141 can be revived in a modernised form, but there is no evidence whatsoever that it will be. Russian hopes for future aircraft carriers appear to be based entirely on CTOL designs.
And what does the MiG-29K have to do with STOVL fighters? It's a CTOL aircraft.
Your ideas on likely secession of Russian regions appear to be based on your usual reasoning. You pick one or two factors & extrapolate them, ignoring all the feedback this will generate, & ignoring other factors which in reality have equal or greater weight. You seem to think of the world as if it was a fantasy role-playing game. I'm afraid it's far more complicated than that.
MiG-29K isn't STOVL, but I mentioned it as an alternative- and indeed, they may have both!
Noone in the West have anticipated USSR breakup- who knows what will happen in the resource rich RFE, a big chunk of which was taken piece by piece from the Ming & Ching China? The Russians sold Alaska to the US- they could not develop & sustain their N. American colony then, just as they can't develop Siberia now. Will they go to war with China to defend underpopulated (will the baby boom last, and where will those people live as adults?), remote, and strategically vulnerable area? I seriously doubt it!