Nigeria, Feb. 1 -- Konstantin Davydenko spent seven years serving a sentence imposed by the Russian Supreme Court in Crimea, which found him guilty of being a Ukrainian spy.

He was locked in a prison facility in Krasnodar, southern Russia. Davydenko calls the prison a terror zone, a place where cruelty was melted only for the sake of it.

"Fear was a key tool in the playbook for tormenting prisoners," he said to PREMIUM TIMES.

His sentence was passed in June 2019, five years after Russia occupied Crimea, a Ukrainian territory which lies on the northern coast of the black sea. The eastern European peninsula had operated as an autonomous republic with its own constitution and regional government subject to Ukraine's central government in ...