If NATO countries want to put enough boots on the ground in the Ukraine they will need to institute the draft first. Can you imagine the revolutions as NATO countries tried to draft their citizens and leave the illegal alien invaders untouched? Try you imagine what would go through conscripted young citizens' minds as they are sent off to die overseas while Muhammad from Algeria stays back at home taking their jobs and f*cking their girlfriends?
Native(white) western Europeans are in such demographic number decline I’m not sure they could sustain much of a troop involved war. Having said that Russia is in some deep issues with respect to that as well.