penalties they could simply just ignore if they choose to. After all, they forced the sale in rubles, despite this not being part of the initial agreement of gas sales.
blowing it up seems just too much of shooting-self-in-the-foot for russia, unless russia can confidently lay the blame onto the west (particularly, the US) as the culprit.
And Russia immediately laid the blame onto the West, and never stopped. Maybe we are now looking at the part of that continuous effort.