I’ll say what I’ve been saying for a while:

“Russia has nukes. Ukraine does not. The outcome was decided before it began.”

Russia will stay in Ukraine as long as it is profitable to do so, and will leave when that is no longer the case or can get something big enough in response to convince them to leave. The US and EU can supply arms to Ukraine to make it less profitable but even so Russia has far more troops and resources than Ukraine. Unfortunately the US also hinged that support on Ukraine not negotiating for peace so they’ve been dug in extra deep in this and lost at least a generation of men now.