That's about the size of it. Under the best of circumstances, Ukraine would become a popular cause attracting mercenaries and gun nuts eager for a challenge, kind of like Spain's civil war. Ukraine sees itself as having been at war since 2014, and had been under a Putin stooge before that. While many have suggested that Ukraine will defend itself, my own bet is that they will fold quickly to get back to semi-normal (if pathetic, undemocratic) existence.

(Will the US population stop the Republican fascist election subversion that is ending our own democracy?)