Uzbek migrant builders have reportedly had their passports confiscated upon arrival and been coerced to join the Russian military.
So it's not even a choice for these people.
Online adverts have been observed in Armenia and Kazakhstan offering 495,000 roubles.
And they are being paid in a worthless currency that can only be used in Russia.
And salaries of 190,000 roubles.
Most of them will not make a salary as they will be dead before they collect their first paycheck. Not speculation, Russia is known to use tactics where they fling human meat at gunner emplacements until they run out of ammo. Then finish off the gun emplacements with advance troops.