He was arrested as soon as he arrived in Russia, lawyers say they have no access to Navajo.

Russian opposition lawyer Alexei Navalny said on Monday they have not been given access to him since he was arrested on Sunday, and that his condition remains unknown.

According to foreign media, Telegrafi, Navajo, the Kremlin critic, was arrested by Russian authorities after arriving in Moscow on Sunday after coming from Germany for the first time since it was poisoned last summer.

In this regard, the United States has reacted as well as some European Union countries, which requested its immediate release.

Russia's Federal Penitentiary Service (FSIN) has demanded that Navalny replace the parole sentence on the Yves Rocher case with effective prison terms before he returns to Russia.

Navajo fell ill on a flight from Tomsk to Moscow in August 2020 and was placed in a coma at a hospital in Siberia before moving to Germany.

Labal tests conducted in Germany, France and Sweden have confirmed that Navally had been poisoned with a Novichok class nervous agent, a confirmed result also by the International Organisation for the Prevention of Chemical Weapons.