According to the source, ambassadors discussed additional restrictive measures against Russian companies and individuals in connection with Ukraine’s territorial integrity issue.
The work will be continued prior to the Council of EU foreign ministers, scheduled on May 12, the source said.
The West imposed sanctions against 33 Russian officials and one bank over country’s reunification with Crimea.
The US expanded the sanctions list last month in connection with the situation in Ukraine, freezing assets and banning entry for seven more Russian citizens and 17 companies.
This list now consists of nearly 50 politicians and businessmen from Russia, including Crimea, as well as from Ukraine.
The EU has also expanded the sanctions list, adding another 15 people to it.
German Chancellor Angela Merkel said last Friday the European Union is ready to follow the United States in implementing new sanctions against the Russian economy.
G7 also threatened Moscow with additional economic measures.
Moscow has repeatedly warned that talking in the language of sanctions is “inappropriate and counterproductive” and warned its Western partners about the “boomerang effect” that sanctions would have.