When the Soviet Union collapsed, government didn’t have much funds to support some small cities around strategically import objects. People of these cities were left all by themselves. Nobody could support them because any communication with this places terminated after the army decided that they now don’t have money to support those objects.
People had to leave their places and move. Some were lucky to find their place under a sun of the Army of new Russian Federation, some less fortunate had to leave such places without any hope to find a new home, just because the shops stopped working, water stopped coming out of the faucet and nobody cared about them any more.
It has been said that even president Putin was thinking of retiring from KGB in 1990 and going to work as a taxi driver. Many people now probably express great sorrow that he changed his mind at that time.