They have been telling that sanctions will crumble Russia but it's not true anymore, after a year of this conflict, the sanctions are not affecting them.
One option is to make a deal with Russia and accept that it's the end of it and Ukraine has to make peace and be neutral to resolve the geopolitical tension which is also the root cause of this war.
Escalating this war to WW3 will be much more dangerous to EU. They can make war with smaller countries but not Russia.
Dangerous to the EU? It would be catastrophic to the whole world. Was WW2 dangerous to only one party? See how affected the world is when it's just Russia and Ukraine directly fighting, now imagine how it would be when the countries of the world would literary be at each other's throats. Everybody is trying to avoid a third world war by any means necessary.
Russia is heavily affected by the sanctions. The fact that you don't know shows how good they are at covering it. Remember during WW2 the Germans at home actually thought they were winning the war.