Just to clear things up:I gusss geography isnt your strongest point.
Most of Russia is to the west (not east) of Tibet , and Lhasa (Tibet's capital) is about 50% further from London than Astana (capital of Kazakhstan).
Flight time from London to Astana (capital of Kazakhstan) is just over 6 hours on a direct flight (assuming they resume post pandemic) and daily..........Tibet is a little longer and more difficult.
Much of Russia is east of Tibet (I didn't say "most" but "much"). Kazakhstan is just as far from NWHL.
Yes, you can fly to Astana with Air Astana (good luck) from Heathrow. With more established airlines, its 12 hours + with at least one stop.
So Thursday evenings in Astana is a distinct possibility next season.