geneva russia commit grave human right violations crimea include imposition citizenship deport prisoners u.n. human right report say monday grave human right violations arbitrary arrest detentions enforce disappearances ill-treatment torture least one extra-judicial execution document report say russian authorities allow u.n. investigation enter crimean territory russia occupy crimea 2014 replace ukrainian laws russian laws annexation never internationally recognize u.n. general assembly order human right investigation december 2016. impose citizenship inhabitants occupy territory equate compel swear allegiance power may consider hostile forbid fourth geneva convention u.n. human right chief zeid ra ad al hussein say statement russia also break international law transport detainees prisoners crimea russia report say occupy crimea russia automatically recognize ukrainians peninsula russian citizens unless send write rejection may 2015 100,000 people percent crimea population russian citizenship report say cite russian official 19,000 people mainly civil servants want keep job russia de facto rule effectively force renounce ukrainian citizenship report say russia say march 2014 referendum legitimize incorporation crimea opponents referendum target laws terrorism extremism separatism forcibly intern psychiatric institutions report say many media outlets shut crimea 22 congregations jehovah witness effectively outlaw report say education ukrainian almost disappear russia ban mejlis body represent crimean tatars whose members subject intimidation house search detention report say russia veto-wielding member u.n. security council mean block attempt hold account fiona frazer head u.n. office ukraine produce report say important document happen crimea victims could record human right violations face try ensure justice accountability russian occupation crimea mark grave human right violations u.n