Russian opposition leader Alexei Navalny detained upon returning home following poisoning

Alexei Navalny gives an speech during a demonstration for the release of the arrested activists during the summer riots in Moscow, on September 29, 2019.
Celestino Arce/NurPhoto via Getty Images
Alexei Navalny, the Russian opposition leader and critic of Russian President Vladimir Putin, has been detained after flying back to Russia on Sunday.
The longtime critic of Russian President Vladimir Putin's regime nearly died after being poisoned in late August and spent the last five months recoverin