What factors could've facilitated a full-blown invasion

If it wasn't filled with smelly muslim Arabs.

Seriously, Dagestan alone is causing more problems than it is worth.

>>2983443
Well, an alien super-scientist named G'Kub would have to come down from the Andromeda galaxy with both a time machine and another specialized machine that turns your stupid, LARPing autism into a weapon that is easy to carry (And obviously devastatingly effective) such that completely ridiculous ahistorical scenarios can be entertained.

Beware, the same technique is being developed by Enrique Sanchez to turn the entirety of the Old World into a Mexican playground and source for Aztec sacrifices. Better beat him to the punch!

>>2983443
That's not how it works mate, look at places like Uzbekistan that were under Russian control for centuries and still are muslim to the marrow (Hell, look at Kalmykia, it's still majoritarily buddhist after almost a thousand years)

You'll need get rid of +90% of Persia's population and somehow get Russians to repopulate the deserted areas.

>>2983459
Your post was cringier than OP's

>>2983443
nationalism never existing as a concept? that or flat out genocide or ethnic dispersing

trying to consolidate persia into the fold would be an even worse version of trying to control Chechnya

>>2983457
>Persia