The call was made by European Union ambassador Lotte Knudsen at the United Nations Human Rights Council in Geneva on behalf of all 27 EU states and 16 other countries, including Canada, the United Kingdom, the United States, and Ukraine.

“We are outraged by the death of the Russian opposition politician Alexei Navalny, for which the ultimate responsibility lies with President [Vladimir] Putin and the Russian authorities,” Knudsen said.

“Russia must allow an independent and transparent international investigation into the circumstances of his sudden death.”

Navalny, Putin’s fiercest critic inside Russia, died at the age of 47 in an Arctic penal colony on February 16, sparking accusations from his supporters that he had been murdered.

The Kremlin has denied any state involvement in the death of the opposition leader and said it does not bow to EU demands.

Russia’s Investigative Committee says it has launched a procedural investigation into the death of the opposition leader, who was laid to rest in Moscow on Friday.