Interestingly, Russia has no storage for the 8m barrels a day it is producing (7.6 in August).
And any well that is turned off might never go on again. So they must sell at any price.
In 2020, with Brent at $20, Russia continued supplying
3/4
https://www.energyintel.com/0000017f-6982-d580-a37f-f99bdebb0000