The Council of the EU said it had issued sanctions against six people - most of whom were scientists and researchers - who were involved in the development of the toxin that caused the death of Kremlin critic Alexei Navalny.
The EU said the people were involved with the development of chemical weapons, particularly epibatidine, that were found in samples taken from the activist's body after his death. The toxin is found in poison dart frogs in South America and not found naturally in Russia.
Russia has demanded that European countries who accuse Moscow of poisoning Navalny to provide concrete data to support their allegations.
People listed under the sanctions programme are subject to an asset freeze and travel ban to the EU.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
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