It’s a little unclear what you mean, like because more than half a million Russian soldiers have already been killed so far and yet the war keeps going, that the people must be responsible for supporting?

Russia is conscripting, so most are not there by choice but required by law. If you draft dodge and get caught, you go to prison, and still just end up on the frontline anyway, since they are emptying their prisons to use as soldiers, too. And these people will be shot and killed by their own side if they attempt a retreat, while fed propaganda and misinformation about their treatment if they surrender. There has been significant human trafficking to support their war effort. They’ve also depended heavily on mercenary forces outside of their military in order to have skilled soldiers, and are now even receiving soldiers from North Korea in order to continue fighting.

Besides that, there are so many factors that go into why a person would decide to join the military and in reality, they are usually economic ones or from extensive propaganda.