Historically—not universally, of course, but frequently enough to be noteworthy—people have been observed to be displeased with leadership that unproductively transforms large numbers of their youth into corpses.
Listen to recordings of calls to Russian soldiers’s mothers. The families fully support invasion. They are glued to TV and Telegram which explain that Ukrainians bomb themselves and Russian soldiers are brave liberators fighting against gay Nazi Americans.
Besides that soldiers send a lot of stolen goods back home. There was an infamous video from the office of a transport company with dozens of soldiers sending loot like washing machines.
Historically—not universally, of course, but frequently enough to be noteworthy—people have been observed to be displeased with leadership that unproductively transforms large numbers of their youth into corpses.