Jailed Kremlin critic Alexei Navalny has been placed in solitary confinement for 10 days in a prison above the Arctic circle for “incorrectly introducing himself” to a guard, his spokesperson said late on Monday.

Russian opposition leader Alexei Navalny addresses demonstrators during a rally to support opposition and independent candidates after authorities refused to register them for September elections to the Moscow City Duma, Moscow, July 20, 2019. (Photo by Maxim ZMEYEV / AFP) (Photo credit should read MAXIM ZMEYEV/AFP via Getty Images)