Buffer zone for Ukraine is a nonsense

The Europeans seem to be getting increasingly desperate with their ideas for a post-war solution for Ukraine. First of all, there is absolutely no sign yet of a post-war situation. Putin wants to carry on the war for as long as he can which could be years. Second, the European idea of setting up a buffer zone between Russian-occupied land and the rest of Ukraine with thousands of peacekeeping-style troops from other countries, is impractical, unrealisable and naive. That wold be a huge area to cover, and the maximum number of troops being envisaged, roughly 60,000, would not cut it. Their role would he impossible to enforce and could lead to a dangerous confrontation with Russian troops. Then what? It beats me why all the clever military commanders around in Europe, and I'm including Brexit Britain here, don't point this all out. Or are they so gungho that they believe something like this could actually work? Putin won't agree to having Nato troops in Ukraine, ever. So if British troops were sent would they have to wear a UN beret or, God forbid, a European Army beret? No one will be fooled by that, least of all Putin. But the whole concept is beyond credibility, unless the buffer zone is protected by, say, 150,000-200,000 troops. But who is going to provide that size force from Europe? And how long would they have to stay there? Twenty, thirty, forty years? It's totally impractical.