They might be able to contribute more if they diverted the military aid they send to Israel.

They won't.

And even if they were capable, the Ukrainian people DONT WANT TO KEEP FIGHTING. If your ideology demands more blood sacrifice, well, step the fuck up. Get your big boy boots on, get your country to declare war and give you a gun, show people how serious y'all are about opposing Putin or whatever. Otherwise, cope and seethe.