https://www.rferl.org/a/eu-limits-russians-entering-bloc/338...
And anyhow, your question was what Europe can really do to end the war. I just listed some practical, low escalation options.
Also why is it taking a long time? Why is Brussels working on a “nuclear” option? Just ban them tomorrow, and seize Russian assets and property in the EU. Have all Russians return to Russia. What is Europe waiting for and why wasn’t this done on day 1 of Russia’s invasion of Ukraine?
For my end am fine with just glassing Russia today, you don't have to convince me.
You're basically asking two nuclear powers to go to war. The US has been sly in its blockades, but anything like what you're suggesting is basically WW-3.
Russia, on the other hand, together with the Syrian government bombed so many hospitals in Syria that Doctors Without Borders stopped reporting the locations of their hospitals.
https://www.theguardian.com/world/2016/feb/18/msf-will-not-s...
https://www.hrw.org/news/2020/10/15/syria/russia-strategy-ta...