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May
From the diary of the USSR People's Commissar for Foreign Affairs V.M.Molotov - a record of a conversation with the US Charge d'Affaires in the USSR W. Thurston about the tense situation in the Balkans and the discriminatory actions of the United States in relation to the USSR
[May 31, 1940]
Archive of the foreign policy of the Russian Federation
Review "The European War and Japan", prepared on the basis of the materials of the Japanese press for April-May 1940 by the adviser to the USSR plenipotentiary mission in Japan Ya. A. Malik
May 1940
Foreign Policy Archive of the Russian Federation
Plan of anti-aircraft defense exercises in the Belorussian Special Military District (summer 1940)
May 1940
National Archives of the Republic of Belarus
Resolution of the Politburo of the Central Committee of the CPSU (b) "On the evacuation of Lithuanians from the regions of the BSSR bordering Lithuania"
May 23, 1940
Russian State Archive of Social and Political History