Every cut in gas by Putin means less sales and more bulk stock in reserve tanks located in Siberia. Revenue will be down and the biting sanctions will be harder on Russia.
Since it is only the EU that has pipes running from Russia to it, soon production will be suspended if there is no storage capacity and little sales.
Then, EU consumers could, Hungarian Billionaire and investor, George Soros, slam an increase in gas import tax. This would in turn put Russia in a tight corner.
Russia may not go unscathed in this energy side of the war in Ukraine.