Russia’s foreign ministry  summoned senior diplomats from several European Union countries to voice discontent over their response to the poisoning attack on opposition leader Alexey Navalny.

State news agency RIA Novosti reported that top diplomats from Germany, France and Sweden had arrived at the foreign ministry in Moscow Tuesday morning.

Laboratories in the three EU states concluded earlier this year that Navalny was poisoned with the Soviet-designed nerve agent Novichok, findings that resulted in EU sanctions against several Russian officials