July 26, 1948
Cipher Message from G. Dimitrov to I. Stalin and V. Molotov
The Bulgarian government is disturbed by the recent dislocations of Yugoslav armed forces along the Bulgarian-Yugoslav border in the Macedonia region. Officials in Sofia fear a Yugoslav attempt to annex Pirin region to Macedonia.
January 11, 1961
Information from MVR Inspectorate on Yugoslav Intelligence Services Against Bulgaria
The Ministry of Internal Affairs reports its intelligence findings on the activities of the Yugoslav intelligence services against Bulgaria. Working both from home and in-country, the Yugoslav intelligence is allegedly trying to gather information on a broad set of issues – ranging from trade relations within Comecon, to Bulgaria’s military capacity and its potential to pose a threat to Yugoslav Macedonia.