The deserts in the middle east would spread, south Asia and southeast Asia would also dry up, not to mention what would happen to South America and Australia. Europe won’t be untouched either, countries like Italy and Greece will face droughts and constant fires every summer.
And calling climate change Russia “habitable” is generous. The permafrost is melting and creating all sorts of problems with infrastructure, agriculture, and is releasing diseases like anthrax into the population that has been frozen for millennia. Not to mention that the mosquitos will go from being a summer time shitty experience to year-round.