"Eastern Poland" was in fact Western Ukraine and Western Belorussia. These provinces had been stolen by Poland when it partitioned Ukraine and Belorussia following its aggression against the soviet republics in 1919-20. The provinces of Lvov, Stanislavov, Tarnpol, and Volyn added to Ukraine had a population of 7 million of which 57% were Ukrainian and 7 % Jewish. The provinces of Novgorodek, Vilno, and Polesie added to Belorussia had a population of 3.5 million of which 50% were Belorussian and 9% jewish.
In regard to the Baltic states, Estonia and Latvia had been part of Russia since 1721. In Estonia, as in Petrograd, power passed to the soviets on 7 November 1917. By February 1918 soviets had been set up in four-fifths of the districts in Estonia, and revolutionary changes were under way. On February 18, 1918, German troops invaded Estonia. In November a bourgeois regime with K. Pats as prime minister was formed with the cooperation of the occupation authorities. On 29 November 1918, units of the Seventh Army, including Estonian regiments, liberated Narva, where the Estlandia Labor Commune was proclaimed that same day. Power passed to the Council of the Commune, whose chairman was Jan Anvelt. The government of Russia recognized the independence of Estonia in a decree signed by Lenin on 8 December 1918. Estonia was subject to foreign aggression. A British squadron invaded on 12 December 1918 and mercenaries from Finland, Sweden, and Denmark were brought to Estonia. Opening their offensive in early January 1919, the combined forces of the interventionists and White Guards smashed the Estlandia Labor Commune.
On 28 September 1939 Russia and Estonia signed a mutual assistance pact, providing for the stationing of Red Army troops in Estonia. In June 1940, Soviet troops entered Estonia with the consent of the Estonia regime. On 21 June workers’ demonstrations took place in Tallinn, Tartu, Narva, and other cities, and the regime was overthrown. A people’s government was formed under the leadership of J. Vares. In the 15 July 1940 election, 93 percent of the electorate voted for the candidates of the Working People’s League of Estonia, a united electoral coalition of the democratic strata. On 21 July 1940, the State Council proclaimed the restoration of Soviet rule and the establishment of the Estonian Soviet Republic. The State Council requested the Supreme Soviet of the USSR to admit Estonia into the USSR. On 6 August 1940 the Supreme Soviet of the USSR granted the request, and the Estonian SSR entered the USSR as a soviet socialist republic.