Why are European troops for Ukraine a nonstarter?

“I think there is absolutely no indication that at the moment Putin is interested in negotiations at all,” said Ian Bond, deputy director of the Centre for European Reform think-tank. “You know, Putin thinks he's winning.”

...“If you are Poland, the prospect of the collapse of Ukraine with millions of refugees flowing across your borders and Russian forces coming up to your border is much, much worse than the prospect of having to do more to shore up Ukraine's current front lines,” said Ian Bond.

But, he added, “We're a very, very long way away from that.”