Kremlin critic Navalny detained after landing in Moscow

Alexei Navalny, centre, and his wife Yulia travel on an airport bus as they arrive at Sheremetyevo airport, outside Moscow, on Sunday (Mstyslav Chernov/AP)
Alexei Navalny, centre, and his wife Yulia travel on an airport bus as they arrive at Sheremetyevo airport, outside Moscow, on Sunday (Mstyslav Chernov/AP)