Russian opposition leader Alexei Navalny pays respect to founder of Russia’s oldest human rights group and Sakharov Prize winner Lyudmila Alexeyeva in Moscow, Russia December 11, 2018. Maxim Shemetov/Reuters President Donald Trump dodged a White House reporter's question on the poisoning of Russian President Vladimir Putin critic Alexei Navalny, saying "we'll talk about that at another time." Navalny, an anti-corruption activist and prominent critic of Putin, was poisoned on a flight from Siberia in late August and has been recovering in a German hospital. At the hospital, the nerve agent Novichok was found in his system, which has been used to poison other Russian dissidents. In his first public message since the incident, Navalny posted on Instagram last week.