I disagree. I think NATO parties would be best. Ideally the U.S., but the UK or Germany could work as well. This isn't about Russia trusting the third party. This is about putting pressure on Ukraine to come to a reasonable settlement. As Ukraine's first and foremost supplier of weapons and other financing, the U.S. is in the best position to leverage that power over Ukraine. Up until now, the U.S. and the U.K. have been doing the opposite, encouraging them to -not- work on a negotiated settlement. Had it not been for their efforts to thwart a peace settlement in favour of "weakening Russia", this whole war might have been over months ago.
An article on this:
https://scheerpost.com/2022/09/01/re...deal-in-april/
For those who like short youtube videos, Lee Camp did one based on the article above here: