<P> Seven months later , the Soviet foreign minister Vyacheslav Molotov accused the Baltic states of conspiracy against the Soviet Union . On June 16 , 1940 , threatening an invasion , Soviet Union issued an ultimatum demanding that the government be replaced and that an unlimited number of Soviet troops be admitted . Knowing that the Red Army had entered Lithuania a day before , that its troops were massed along the eastern border and mindful of the Soviet military bases in Western Latvia , the government acceded to the demands , and Soviet troops occupied the country on June 17 . Staged elections were held July 14 -- 15 , 1940 , whose results were announced in Moscow 12 hours before the polls closed ; Soviet documents show the election results were forged . The newly elected `` People 's Assembly '' declared Latvia a Socialist Soviet Republic and applied for admission into the Soviet Union on July 21 . Latvia was incorporated into the Soviet Union on August 5 , 1940 . Latvian diplomatic service continued to function in exile while the republic was under the Soviet control . </P>
<P> Seven months later , the Soviet foreign minister Vyacheslav Molotov accused the Baltic states of conspiracy against the Soviet Union . On June 16 , 1940 , threatening an invasion , Soviet Union issued an ultimatum demanding that the government be replaced and that an unlimited number of Soviet troops be admitted . Knowing that the Red Army had entered Lithuania a day before , that its troops were massed along the eastern border and mindful of the Soviet military bases in Western Latvia , the government acceded to the demands , and Soviet troops occupied the country on June 17 . Staged elections were held July 14 -- 15 , 1940 , whose results were announced in Moscow 12 hours before the polls closed ; Soviet documents show the election results were forged . The newly elected `` People 's Assembly '' declared Latvia a Socialist Soviet Republic and applied for admission into the Soviet Union on July 21 . Latvia was incorporated into the Soviet Union on August 5 , 1940 . Latvian diplomatic service continued to function in exile while the republic was under the Soviet control . </P>
when did latvia became part of the soviet union
when did latvia became part of the soviet union
August 5 , 1940
August 5 , 1940