(FILES) This file photo taken on August 22, 2020 shows German army emergency personnel loading into their ambulance the stretcher that was used to transport Russian opposition figure Alexei Navalny at Berlin's Charite hospital, where Navalny is treated after his medical evacuation to Germany following a poisoning. - Tests carried out on Russian opposition leader Alexei Navalny provide clear proof that he was poisoned by a chemical nerve agent, the German government said Wednesday, September 2, 2020, demanding explanations from Moscow. (Photo by Odd ANDERSEN / AFP)