A European Union source says ambassadors of the trade bloc's countries have agreed to add 11 new names to the list of people sanctioned for participating in the pro-Russian insurgency in Ukraine's east.

The source, who spoke on condition of anonymity because she was not authorized to make public statements on the matter, said the decision would be implemented through formal written procedure by the end of this week. She did not disclose the names of any of the people targeted.

The EU has already imposed asset freezes and travel bans on 61 people and two companies for participating in the armed rebellion against the Ukrainian government or Russia's occupation and annexation of the Crimean Peninsula.