Wth? They treated it like a towed arty
That's SPG abuse

Enlisting in the Russian Army ... look who's enlisting

I'd say MIG-35 is a nice candidate for a lighter aircraft.
There's also a MIG-41 in the pipeline but I doubt Russia will have it for export.

Only issue is RMAF procurement leanings which (I observe) tend to favor US/western sources.
Heck, it's about time they get a few attack helicopters (AH64 calibre or equivalents), not light peashooters.

P.S PAK-FA = SU-57. Russia officially adopted it into service.

Well it turns out they're upgrading our current MIG-29 to MIG-29NM - source
This is an interesing write-up on the MIG-29 upgrade choices - source
Oh noes! ... did RMAF sell its MIG-29 to India - source

The parts issue is never a factor if their service setup was professionally run.
See this typical BS crap they're pulling on defence assets - source.
Heard of the missing engine case? That just reinforces what's written above.