Russian opposition leader Alexei Navalny was detained on Sunday upon his arrival in Moscow. He had spent nearly the last five months recovering in Germany after being poisoned in August.

Russian opposition leader Alexei Navalny looks on ahead of a hearing at the European Court of Human Rights (ECHR) in Strasbourg on November 15, 2018. – ?Top Kremlin critic Alexei Navalny heads on November 15 to the European Court of Human Rights which will rule on whether his repeated arrests were politically motivated. The court in Strasbourg must decide whether Navalny, an anti-corruption campaigner and President Vladimir Putin’s most vocal critic, was arbitrarily arrested and detained by Russian authorities. Between 2012 and 2014 he was arrested seven times at public gatherings and prosecuted for either breaching procedures for holding public events or disobeying a police order. (Photo by Frederick FLORIN / AFP) (Photo by FREDERICK FLORIN/AFP via Getty Images)