Russian foreign ministry spokeswoman Maria Zakharova on Sunday accused Germany of stalling efforts to probe Putin-critic Alexei Navalny’s case, Republicworld.com reported.

Zakharova’s accusation comes after Berlin demanded Moscow to provide an explanation over Navalny’s poisoning or face sanctions. Zakharova reportedly said that the German authorities failed to respond to a request by Russian prosecutors, which was sent on August 27.

As per reports, Zakharova, who spoke after German Foreign Minister Heiko Maas demanded an explanation, said that if the German government is sincere in its statements, then it should be interested in preparing a response to a request of the Russian Prosecutor General’s Office as soon as possible.

She said that so far Russia is not certain that Germany is not playing a “double game.” “Where’s the ‘urgency’ you are insisting upon?” Zakharova said and added that by not sending the answer, Berlin was stalling the process of investigation for which it’s calling.

Germany had said that it will discuss possible sanctions on Russia over the poisoning of Navalny if Kremlin does not provide an explanation soon.