They stopped buying (some) energy, and shut down their heavy industry to teach Russia a lesson (in self-harm). Now they're buying Russian fertilizer and steel as well as energy, and all at higher prices via middlemen :p
Russia recently became the world's 4th-largest economy, and all thanks to sanctions forcing them to invest and move up the value chain.
Another decade of self-harm and the European members of NATO will be dependant on Russia for food, pharmaceuticals and ammunition too.
But never handbags. Euroland makes the best mushroom-leather handbags in the world. Worthy partners for Biden, less so for Trump.