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Russian economy is not doing that well. But yeah. It's doing well enough to continue. War material output is also constantly increasing.
I agree. They see no reason to stop. The West has already sent most of what it could easily spare and has not ramped up production to the degree Russia has. Russia is winning the war of material and it only gets worse for Ukraine.

Yes. In order for there to be a line somebody has to enforce one. Nobody in the West will do that. They talk about sending troops after a peace deal but not to enforce one.