Russia don't has much in its hand. Europe has came together to despise Russia for its war in Ukraine. Russian economy is being systematically choked by US and allies. Most of the European nations are only trying to just supporting US, even if they are facing short term challenge.
Europe has not done a single thing to harm Russian economy. If anything EU has helped rebuild Russian economy ever since they invaded Ukraine. Have you checked Ruble exchange rate lately? It is at an all time high ever since 2015!!!
US tried to turn Ukraine into Afghanistan for Russia and make them get stuck there like US did for 20 years spending $7 trillion while achieving nothing. But so far the biggest harm has come to innocent people of Ukraine who are being killed or dislocated and then EU with the way inflation and food scarcity is hitting people pushing middle class into lower class and lower class to homelessness.