Looks like they'll fly to the south of Russia - AF264 is the first of these Asian flights underway today and currently heading 105 deg towards the direction of OTP/IST.

https://www.flightradar24.com/data/f...af264#2af827c9

I've tried to plot the approximate route on GCM and it suggests that the flown distance will be roughly 15% more - not as much as I thought. Probably similar distance to the days before China opened its airspace.

Great Circle Mapper