Why is the Russian prison in the corner of Provi Dzheniya unguarded and without walls?

Since there is no one outside the prison, all the escaped prisoners are dead, and there is no need for a fence.

There are also such prisons in Xinjiang, China. Fiona Fang is surrounded by deserts for hundreds of kilometers. If people walk on foot, there is only one ending-death.

So prisoners can live if they stay inside, and escape is death.