Estonia is planning to cover a 136-kilometer (84-mile) stretch of land along its border with Russia with state-of-art technology to combat illegal border-crossing and illicit traffic.

The Border Police said Friday the surveillance, including sensors, cameras and radars, would beef up security at the border of the European Union member.

The agency said some 80 kilometers (50 miles) of land had already been cleared, and buoys will be installed to mark the border on rivers and lakes.

Estonia, a former Soviet republic, has been unsettled by tensions in Ukraine and Russia's annexation of Crimea. This month, an Estonian security service officer was sentenced in Russia for spying in a case that Estonia dismissed as revenge for his investigation into a Russian smuggling ring on the border.