Yes, Belarus was part of the initial four republics that entered into the Treaty of the Soviet Union that created the USSR. The four were Russia, the Ukraine, Belarus and the Transcaucasus Federation, which was a federation of the republics of Georgia, Azerbaijan and Armenia.
The USSR.
They were all part of the USSR.
Lithuania and Latvia
The countries that used to be part of the USSR and are now members of the European Union are the so-called Baltic countries: Estonia, Latvia and Lithuania.
Lithuania declared independence from USSR in 1990 and lived forever and after.
As far as we know, no. The USSR did not maintain nuclear weapons in Lithuania.
Liubomiras Lauciavicius was born on June 15, 1940, in Lithuania, USSR (now Lithuania).
Countries which used to be parts of the USSR: Russia, Ukrain, Belorussia, Moldova, Latvia, Lithuania, Estonia, Georgia, Armenia, Azerbaijan, Kazakhstan, Uzbekistan, Turkmenistan, Kyrgyzstan, Tajikistan. No country used to be a part of Russia. Russia itself was a part of the USSR.
Vitautas Rumshas was born on December 3, 1951, in Plunge, Lithuania, USSR [now Lithuania].
Lithuania had declared neutrality on the eve of WWII, therefore was NOT obliged to fight in WWII. It was the Molotov-Ribbentrop pact that sealed Lithuania's fate in the 2nd World War. Lithuania never took any military actions as a state neither against the USSR, nor Nazi Germany. The only Lithuanians that took part in actually fighting in WWII was the 16th Lithuanian gunners division in the Red Army (created after occupation of Lithuania in 1940 June 15th by the USSR)
The USSR was a Russian empire. Most countries in Eastern Europe used to be part of Russia, and was under Russian control during the Soviet Union's reign. Estonia, Latvia, Lithuania, Belarus, the Ukraine, Moldova, Georgia, Armenia, Azerbaijan, and Kazakhstan were all part of the USSR and Finland achieved independence just prior to the formation of the USSR.
They are Estonia and Latvia. Along with Lithuania (west of Latvia), they were annexed as republics by the Soviet Union after World War II. They gained independence again with the breakup of the USSR in 1991.