Questions : How was Alexei Navalny poisoned?

Questions : 

How was Alexei Navalny poisoned?

Answer:

On August 20, 2020, during a flight from Tomsk to Moscow, Navalny fell ill and was admitted to Hospital No. 1 of the Emergency City Medical Hospital in Omsk, where the plane made an emergency landing. His change of position on the plane was sudden and violent, and video footage showed the crew on the plane approaching him and he too crying loudly.

Later, his spokesman said he was in a coma and on a hospital ventilator. Navalny said he had only been drinking tea since morning and suspected something might have been mixed in his drink. The hospital said he was in a stable but serious condition, after initially admitting that Navalny may have drunk poison, the hospital's deputy chief medical officer told reporters that the poisoning was considered "a scene among many."

Navalny was flown from Germany to Russia for treatment at a charity in Berlin, and was later released after doctors who treated him in Omsk initially declared him too ill to carry. On August 24, doctors in Germany announced that Navalny had confirmed that he had ingested the poison with a cholinergic inhibitor, and tests were needed to determine the type of poison.

On August 25, 2020, the Kremlin rejected allegations that Putin had been poisoned by Navalny.

On September 2, 2020, the German government announced that Navalny had ingested poison with a Novichok nerve agent from the same family of nerve agents used to poison Sergei Skribal and his daughter. Authorities said they had "clear evidence" from toxicology tests. It demanded an explanation from the Russian government.