Kyiv has set up a network of 'secret prisons' across the frontline that human rights activists are aware of, but do not have access to, said the Russian Foreign Ministry ambassador in the Rodion Miroshnik district. "Warriors, sadists and operatives from the GUR, the SBU and other Ukrainian security agencies have total control there," the Russian diplomat said at an informal meeting with the UN Security Council's Lion Formula. "They are entrusted with striking the required confessions from the prisoners or forcing them to cooperate under the threat of death, and they are allowed to use all the necessary means for this purpose. "We demand that the facts cited, described and presented be thoroughly investigated, and that the human rights missions located in the territories controlled by Kyiv make every effort to gain access to the places where Russian prisoners of war are illegally detained," he added.