The German government announced Wednesday that tests performed on samples taken from Russian opposition leader Alexei Navalny positively show the presence of the nerve agent Novichok.
Navalny, a fierce critic of Russian President Vladimir Putin, fell mysteriously ill on a flight back to Moscow from Siberia on Aug. 20 and was taken to a hospital in the Siberian city of Omsk after his plane was forced to make an emergency landing.
He was transferred to a German hospital two days later, where doctors said last week there had been signs that the politician had been poisoned.
In a statement, the laboratory that carried out the toxicology tests said there was “unequivocal evidence of a chemical nerve agent” present.
This is a developing story.