Russian anti-corruption activist and opposition leader Alexei Navalny falls ill on a flight from Tomsk to Moscow, and is rushed to a hospital in Omsk after an emergency landing. His spokesperson, Kira Yarmysh, says it was suspected that he was poisoned by something mixed into his tea, with Navalny's team suspecting that it was in the airport café shortly before his flight. He is reported to be in a coma. French President Emmanuel Macron and German Chancellor Angela Merkel have offered Navalny medical assistance and unspecified protection in their countries.
3,000 U.S. troops are deployed in Poland as part of NATO's Operation Atlantic Resolve. Poland says that the deployment is a necessary response to Russian military exercises near its border and its intervention in Ukraine while Russia condemns the move as a "threat to national interests and security".
Russian president Vladimir Putin lifts the ban on delivery of S-300 missile air defense systems to Iran in connection to the nuclear dialogue. Israel and the United States oppose the deal on the grounds that Iran is a state sponsor of terrorism.