Government spokesman Steffen Seibert said in a statement special labs in Sweden and France have confirmed the initial results from Germany.
He said: “On September 2, 2020, the Federal Government announced that, at the instigation of the Charité-Universitätsmedizin Berlin, a special Bundeswehr laboratory had carried out a toxicological test using samples from Alexej Nawalny.
“Thereby the unequivocal proof of a chemical nerve warfare agent of the Novitchok group was provided.
“This constitutes a serious violation of the Chemical Weapons Convention (CWC). The federal Government has therefore included the Organisation for the Ban on Chemical Weapons (OVCW) in the analysis of evidence in the Navalny case.
“This involvement of the OPCW is based on Art. VIII 38 (e) of the CWC, which gives all contracting states the opportunity to receive technical support from the OPCW.
“On this basis, the OPCW took samples from Mr. Nawalny and took the necessary steps to have them examined by the OPCW reference laboratories.
“The federal Government has also asked the other European partners France and Sweden for an independent review of the German evidence based on new samples from Mr. Nawalny.
“The results of this review by special laboratories in France and Sweden are now available and confirm the German evidence.
“Regardless of the ongoing investigations by the OPCW, three laboratories have now independently provided evidence of a nerve agent from the Novitchok group as the cause of Mr Navalny’s poisoning.
“We renew the call for Russia to explain what has happened. We are in close contact with our European partners on further steps.”
Additional reporting by Monika Pallenberg.
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