There are other sources of power and gas... Biden said he will 'surge' supplies to Europe... in the medium term they can just write russia out of the equation and stop bankrolling the war.
If they declare force majure and seized a boat to ship now, there would be hell to pay for some other consumer.
So they can make big inroads into their static gas consumption by rolling with that and shutting down some or all of their gas power stations instead... it seems they have options to trim their usage to the point they can prepare for winter without funding their own security threat.