GENEVA,– The UN rights chief called Tuesday on Moscow to conduct or cooperate with a “thorough, transparent, independent and impartial investigation” into the alleged nerve agent attack on Russian opposition leader Alexei Navalny.

“The number of cases of poisoning, or other forms of targeted assassination, of current or former Russian citizens, either within Russia itself or on foreign soil, over the past two decades is profoundly disturbing,” Michelle Bachelet said in a statement.

In Navalny’s case, she stressed that “it is incumbent on the Russian authorities to fully investigate who was responsible for this crime – a very serious crime that was committed on Russian soil.”