A solution ? - a Conference arranged in a neutral venue, with US,UK,France,Russia,China, Japan,India,Pakistan,Brazil,Germany,North Korea,Canada,South Korea,Australia, and others, to not only resolve this Ukraine war, but *more importantly* formulate a new security structure for the entire world, to be signed by them all and legally binding on them all.
A new security structure will have be ironed out eventually anyway, if peace is to be ever reached.