I think you're projecting here. There are plenty of people who will willingly pick up a gun and plenty who won't. Ukraine is the perfect example of that. You know nothing about the person you're replying to in order to know which group he'd really belong to.
Whoever wants to get in the fight can do so right now.
The Ukrainian government looks to have created its own foreign legion, so you'll even technically be fighting under the Ukrainian flag as a uniformed soldier.
Enlistment period is indefinite: until the "state of emergency" ends.
Update based on new information: Russia doesn't acknowledge the Ukrainian Foreign Legion (they keep rebranding, not sure what they'll end up sticking with), so if you get captured, the Russians will treat you like a criminal, and not an EPW.
But he is correct in his assertion that the vast majority will not. America is a soulless nation that “just works” as long as we’re all making money from it.
The second push comes to shove and we need to mobilize the nation ala-WW2 our leaders will realize just how deeply they played themselves.