MOSCOW—Supporters of Kremlin critic Alexei Navalny said a bottle found in the hotel room where he stayed before he fell ill last month was proved to have traces of Novichok, the nerve agent used to poison him, raising questions about the time line of events that led to his collapse.
After Mr. Navalny fell ill on a plane to Moscow, his supporters returned to the hotel room and gathered what they could find, including at least three water bottles, a statement on Mr. Navalny’s Instagram account said Thursday. The items were sent…