"When propaganda conflicted with reality and nobody believed the propaganda anymore." This is also what has begun to happen in lower income brackets of Trump supporters. You can't argue with the empty wallet. The curtain is pulling back on the entire charade. In Russia, and hopefully in the US.
It’s also partly that Ukrainian success with drone technology has really prevented Russians from moving forward. The system is running into reality, and that’s how Soviet Union finally broke down. When propaganda conflicted with reality and nobody believed the propaganda anymore.