Russia can do plenty. Like fuckup the US's overthrow of Assad so they can build their precious nat gas line through Syria that Assad won't allow. Russia put a stop to that. Now it's down to how much blood is the US willing to spill in order to ensure Europe gets free of Russia's natgas hold on them.
No one forces the EU to buy gas from Russia. Besides, the US successfully completed huge liquid gas terminal facility at its EU satellite - Lithuania, so there is an alternative supply since 2014.
