Ukraine

That hasn't worked out in the past. The only way it will work is if the "Peace Keepers" are armed to the teeth and ready brawl. Putin will never go for it. In the end the US will sell Ukraine out unless they sign their independence and control of their resources away to the Trump administration. And our once independent media will push it as a triumph for America.
Its worked in Kosovo/Serbia and Korea.

And yes I think the peacekeepers will be well armed. But their real value is basically tripwire forces. Putin couldn't attack without effectively declaring war on the countries that send peacekeepers

I would really like to have heard the alternatives, that didn't involve direct intervention of outside (probably mostly US) forces. The current trajectory was/is not favoring Ukraine at all