Over 400 detained in Russia as country mourns the death of Alexei Navalny, Putin’s fiercest foe

Read MoreA prominent rights group says over 400 people have been detained in Russia while paying tribute to opposition leader Alexei Navalny, who died at a remote Arctic penal colonyA prominent rights group says over 400 people have been detained in Russia while paying tribute to opposition leader Alexei Navalny, who died at a remote Arctic penal colony