Russia has bristled at the demands for an investigation, saying that Germany needs to share medical data in the case or compare notes with Russian doctors.
Germany has noted that Russian doctors have their own samples from Navalny since he was in their care for 48 hours.
Germany has also enlisted the Hague-based Organization for the Prohibition of Chemical Weapons for technical assistance.
Read also: Alexei Navalny Poisoning Case Now Involves Global Chemical Weapons Watchdog
The agency has collected independent samples from Navalny for testing, but results haven't yet been announced.
German doctors have said the Putin critic could make a full recovery, though haven't ruled out the possibility of long-term damage from the nerve agent.
Spiegel said that the Russian opposition leader was joking and alert in the interview with them, though his hands shook so much it was difficult for him to drink from a bottle of water.
He also reiterated what his team has previously said — that he planned on returning to Russia when he was able.
“My job now is to remain the guy who isn't scared,” he was quoted as saying. “And I'm not scared.”
(Writer & Editor: The Associated Press)
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