"The expulsion of diplomats was not the best solution. It has put in motion the escalation spiral, which may seriously backfire," Stegner told the Sueddeutsche Zeitung newspaper.
The German lawmaker also demanded that London finally provide evidence that Russia was responsible for the attack on Skripal. He also pointed out that in line with European values, assumptions and plausibility were not enough to accuse somebody.
Russia has strongly rejected the accusations, and retaliated by expelling the same number of UK diplomats and closing the British Council in Russia.