Armenia and Azerbaijan agree to a ceasefire in the disputed Nagorno-Karabakh effective 03:00 am local time, following Russian-brokered peace talks in Moscow. However, fighting continues and both sides accuse each other of violating the agreement.
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.
As many as 50,000 people gathered at ongoing protests in Moscow against the Russian authorities preventing several opposition candidates from running in the election, which turned into a protest against the government in general. It is the biggest such event since the 2011 protests.
Amnesty International reports at least 200 civilians have been killed in Russian air strikes in Syria, indicating "serious failures by Russia to respect international humanitarian law". Moscow denies causing civilian deaths.