Their supporting Ukraine is supporting Ukraine to fight, not to seek peace. As Boris Johnson made it clear to Zelensky regarding to Istanbul agreement with Russia: We (west) won't sign it. If you sign it, you will be on your own in the future. If you don't sign it we will support you to fight. Clearly Ukraine is an ally and valuable to the west only if they fight Russia. Otherwise they're worthless to the West.
This message has been edited 2 time(s).