The Nordic and Baltic countries have demanded that Russia immediately release an Estonian security service officer who was abducted by unknown gunmen a week ago and taken across the Russian border.

The eight foreign ministers expressed "deep concern" over the Sept. 6 arrest of Eston Kohver who is being held in custody in Moscow.

Russia claims he was detained on its territory. Estonia says Kohver was investigating cross-border crime when he was abducted at gunpoint on Estonian territory.

In Brussels, the European Union said the abduction on Estonian territory "runs against international law and the principle of inviolability of borders" and urged Kohver's immediate release.

Kohver faces up to 20 years in jail under Russian law if found guilty of spying, which Russia suspects.