North Korea is using its global diplomatic network to spy on not only Europe but also close allies like Russia and China, seeking sensitive military technology, Estonia has warned.

DPRK intelligence agents are most active in Chinese cities like Beijing, Dalian and Shenyang, as well as Moscow and the Russian city of Blagoveshchensk near the Chinese border, the Estonian Foreign Intelligence Service said in its yearbook published on Tuesday.

North Korea seeks to send students to Russian universities to study nuclear and other high-technology fields, the agency said, adding that the country eyes information to advance its defense industry, manufacturing