I'm pretty sure Europe is cut off from Russian energy for years at this point because so much infrastructure has been destroyed (including Nord Stream 1), and if the conflict lasts into the winter, Russian's production capability will be set back by decades as they don't have the means to store the volumes they need to produce in order to keep their equipment from seizing in the cold.
Russia could produce and burn the stuff to keep the well heads from freezing. Think Saddam Hussein in 1991, but not quite as bad because the Russians wouldn't set the well-head equipment on fire, but burn it a bit away from the well, and in a way they could easily put out.
