With temps in Russia that cold you should be running 10w-30 according to the manual. 20w-50 is WAAAY to thick for "negative temperatures".
It is very important to oil level check exactly like the manual states.
The "cold check" is to simply know if it's safe to start the bike and run it until warm. The "hot check" is to tell you if there is the proper level of oil in the bike.
Even removing the oil cap (like the manual states) caused the level to change drastically!