June 14, 1940 Soviet Union begins air and naval blockade of Estonia.
June 14, 1940 Soviet air force shoots down Finnish civilian plane "Kaleva" flying from Tallinn to Helsinki.
June 14, 1940 Soviet Union gives ultimatum to Lithuania to form a new government and allow free access for Red Army. The president of Lithuania, Antanas Smetona, proposes armed resistance. Failing to secure support from government or armed forces, he decides to leave the country, so that he could not be used to legalise the occupation.
June 15, 1940 Soviet Union occupies Lithuania. President Smetona flees through Germany first to Switzerland then to USA, 1941, where he dies on January 9, 1944, in Cleveland. Prime minister Antanas Merkys yields to Soviet demands, attempts to catch Smetona. Vladimir Dekanozov lands in Kaunas to supervise annexation of Lithuania.
June 15, 1940 at 03:00 Soviet troops storm and capture Latvian border posts Masļenkos (Maslenkis) and Smaiļi.
June 16, 1940 Similar ultimatums were given to Estonia and Latvia.
June 16, 1940 Prime minister of Lithuania Antanas Merkys removes Antanas Smetona from the post of president and, contrary to Lithuanian constitution, assumes presidency himself.
June 17, 1940 Estonia and Latvia submit to Soviet demands and are occupied. Prime minister of Lithuania Antanas Merkys assigns Justas Paleckis as new prime minister, resigns and is arrested.
June 18, 1940 Sweden and Germany sign treaty allowing transit of German soldiers from Norway using Swedish territory.
June 19, 1940 A demonstration is staged in Vilnius in support of Soviet Army.
June 20, 1940 New Latvian government of Moscow-approved ministers is formed.
June 21, 1940 New Estonian government containing only left-wing activists is formed. Soviet Union arrange a number of Red Army backed support demonstrations in several cities.
July 8, 1940 Sweden and Germany sign treaty allowing transit of German war material between Norway and ports in Southern Sweden.
July 11, 1940, Baltic Military District is created by Soviet Union at Riga, on the territories of theoretically still independent states
July 14, 1940 – July 15, 1940 Mock elections in Estonia, Latvia and Lithuania, where non-communist candidates were disqualified, harassed and beaten. Results of Latvian "elections" published in advance in London by accident.
July 17, 1940 The acting president of Lithuania, Antanas Merkys, is imprisoned and deported to Saratov, Soviet Union. He dies March 5, 1955.
July 21, 1940 – July 23, 1940 New Soviet-backed Estonian assembly transforms Estonia according to Soviet style, disregarding existing constitutional framework for government restructuring.
July 21, 1940 New Latvian Saeima accepts wide nationalisation and Sovietization decrees.
July 22, 1940 The president of Latvia, Kārlis Ulmanis, is arrested and deported to Russia, never returning. He died in a prison in Krasnovodsk on September 20, 1942.
July 23, 1940 Heads of Baltic diplomatic missions in London and Washington, D. C. protest against Soviet occupation and annexation of their countries.
July 23, 1940 Sumner Welles' (US Under-Secretary of State) Declaration. United States applies the precedent of earlier Stimson Declaration to Baltic states, pursuing a policy of non-recognition of annexation of the Baltic States de jure. Most other Western countries maintain similar position until restoration of Baltic states' sovereignty in 1991.