Europe has made a long, long journey, from being ravaged by World War 2, through several lengthy eras of demilitarization and peace, and then relaxed somewhat when the biggest menace to its existence and peace, the Soviet Union, collapsed. Instability, inherent dangers involved with that, along with some relaxing as the remains, mainly Russia, turned out not to be nearly as powerful, and some of the former soviet Republics, very appreciative of freedom they'd never enjoyed in their history, including Ukraine, felt their way through political upheaval, growth, and then the old Russian insecurities leading to attempts to re-assert its power by blowing up its smaller neighbors.
It's population, double that of Russia, and its political unity, a new thing, something Joe Biden helped revive when it seemed to be fading, is coming to grips with the reality of not having to depend on the United States, and of possibly not needing the United States. They have a very realistic view of the leadership vacuum that has been created by our impossibly stupid re-electing of a burned out, demented, psychotic shell of a human being. They'll figure out how not to take him seriously, and they'll be able to ensure a peace in Ukraine satisfactory to the Ukrainian people, and develop an agreement to secure it.
One thing we know, from observing the war. Russia does not have the power or ability to invade Europe. The countries on its western border, except Belarus, are in NATO, and if it took three years to pick apart three Ukrainian provinces, they have no hope in Europe, and they fear nuclear holocaust just as much as the rest of us do. In fact, a crazy, insane, demented Trump is a bigger danger in that regard, by far, than a blustering Putin.