Why do you think that?
Aeroflot is selling round trips from Moscow to BKK/HKT for 600-700 USD (depending on how trustworthy the exchange rate is) with wide open availability every day in the near future.
And demand TO Russia is almost nonexistent. (Edit: and is available for similar pricing from Aeroflot anyway)
Demand does pick up TO Moscow in warmer months, an unrelated example is CZ, HU and CA competing in the Moscow- PEK and PKX route in NS23. Obviously Bangkok does have trash yields, and even Aeroflot is going 3pw from June to September.