TALLINN, May 28 (RIA Novosti) - The Estonian Citizenship and Migration Department has imposed a permanent ban on 398 visitors, and a temporary ban on 1,615 potential comers, a department spokesperson said Monday.

Anne-Maarja Olei said the ban mostly covered Russians, Ukrainians and Armenians, some of whom could pose a threat to Estonian sovereignty. Foreigners who have been arrested by the police over public order violations were also put on the black list.

The Estonian Citizenship and Migration Department said 11 people, including three Russians, were extradited from Estonia in April.

Relations between Estonia and Russia have been marred since the scandal around the removal of a Soviet-era memorial from central Tallinn shortly before VE Day celebrations. The removal sparked violent protests from the ex-Soviet republic's ethnic Russian minority. One person was killed and several dozen injured in clashes with police April 27. Moscow issued strong protests, with some parliamentarians calling for cutting diplomatic ties with Tallinn.