Russia violates the rights of annexed Crimean peninsula residents with impunity, a UN report published on Monday states, citing arbitrary detentions, forced disappearances and torture.

Russia annexed Crimea from Ukraine in March 2014 which met with economic sanctions from Western countries which refused to recognize Moscow’s land grab or a subsequent referendum.

The UN Office of the High Commissioner for Human Rights (OHCHR) accused Russian “state agents” of grave human rights violations in Monday’s report. At least one extrajudicial killing was documented on the Black Sea peninsula, the OHCHR said.

“Failure to prosecute these acts and ensure accountability has denied victims proper remedy and strengthened impunity, potentially encouraging the continued perpetration of human rights violations,” the report states.