The international non-governmental organization Amnesty International has urged UN agencies and experts to urgently send a mission to Ukraine to visit all the detention sites for prisoners held in connection with the conflict in the country's eastern region.

"Amnesty International is calling on relevant UN agencies and experts to undertake an urgent mission to Ukraine to visit all detention sites for prisoners held in connection with the conflict – including unofficial places of detention. Those that should take part include the Subcommittee on Prevention of Torture and other Cruel, Inhuman or Degrading Treatment or Punishment, the Working Groups on arbitrary detention and enforced disappearances, and the Special Rapporteur on torture," the organization said in a report on torture and killings in eastern Ukraine, which was presented in Kyiv on Friday.

Presenting the report at a press briefing, Deputy Director for Europe and Central Asia at Amnesty International Denis Krivosheev has addressed the Ukrainian leadership asking them to ensure that all allegations of torture by the anti-terrorist operation forces should be checked.

"I want to hear Ukraine's stand on the complete inadmissibility of torture. But our main demand is to probe all the allegations of torture... There are reports of torture by the forces subordinated to Kyiv. All of then have to be verified," he stressed.

Krivosheev also urged the Ukrainian authorities to do their best to check the reports of mistreatment that took place in the territories beyond government control.

He also urged the parties to the conflict to abandon the use of torture, the cruel treatment of captives, and to respect international law.

"Torture and cruel treatment are a war crime. Concrete people should be held responsible for these, no matter on which side of the conflict they are," Krivosheev said.