Russia went completely off the rails when Putin chose to invade Ukraine at the same time as global oil prices were dropping. Putin’s war calculations were based on much higher oil & gas prices. In addition, Putin did not expect a unified western reaction to his aggressive actions in Ukraine, so he was taken by surprise when western economic sanctions began taking a bite out of Russia’s ability to obtain high tech western equipment and expertise.
As Russia’s economy suffered, so did its ability to support medical care, education, and other critical infrastructures such as transportation, housing, and energy infrastructures. To top it off, Russia’s military systems had become dependent upon technologies and expertise that Russia no longer possesses. Under the sanctions regime, it became more difficult for Russia to modernise its Soviet-era military.
As the old guard quickly ages and dies, Russia’s new guard is finding it more and more difficult to maintain all the structures of governance and modern life which they are inheriting from a wealthier, more motivated, and more powerful past. They are making a brave show of it, but the will is more anemic and the heart is growing smaller under the personality cult of Putin.
This is a bit detailed, but I found it interesting: