Sovetskaya Litva found itself free at the same time as the fall of Supreme Soviet of the Lithuanian SSR, what change allowed both of the actions to happen?
Supreme Soviet of the Lithuanian SSR The Supreme Soviet of the Lithuanian SSR (Lithuanian: "Lietuvos TSR Aukščiausioji Taryba" ; Russian: Верховный Совет Литовской ССР , "Verkhovnyy Sovet Litovskoy SSR") was the supreme soviet (main legislative institution) of the Lithuanian SSR, one of the republics comprising the Soviet Union. The Supreme Soviet was established in August 1940 when the People's Seimas declared itself the provisional Supreme Soviet. According to the constitution it was very similar to modern democratic parliaments: it was elected every four (later five) years and had the power to create, amend and ratify the constitution, laws, and treaties and appoint officials in the Council of Ministers (the executive branch). However, in reality the elections were staged, the Soviet had very little actual power and carried out orders given by the Communist Party of Lithuania (CPL). The situation changed in 1988, when the Lithuanians began seeking independence from the Soviet Union. The political power shifted from CPL to the Soviet, which adopted a number of important constitutional amendments and laws, paving the way for the independence. The first free elections were held in February 1990 and were won by pro-independence Sąjūdis. During its first session the Supreme Soviet adopted the Act of the Re-Establishment of the State of Lithuania and renamed itself the Supreme Council of the Republic of Lithuania.
The Barricades The Barricades (Latvian: "Barikādes" ) were a series of confrontations between Latvia and forces loyal to the Soviet Union in January 1991 which took place mainly in Riga. The events are named for the popular effort of building and protecting barricades from 13 January until about 27 January. Latvia, which had declared restoration of independence from the Soviet Union a year earlier, anticipated that Soviet Union might attempt to regain control over the country by force. After attacks by the Soviet OMON on Riga in early January, the government called on people to build barricades for protection of possible targets (mainly in the capital city of Riga and nearby Ulbroka, as well as Kuldīga and Liepāja). Six people were killed in further attacks, several were wounded in shootings or beaten by OMON. Most victims were shot during the Soviet attack on the Latvian Ministry of the Interior on January 20. One other person died in a building accident reinforcing the barricades. Casualties among Soviet loyalists are considered likely, but the exact number remains unknown. A total of 15,611 people have registered as having been participants of the Barricades.