Temporary capital of Lithuania during the invasion of Poland, to Lithuania according to the Soviet–Lithuanian Mutual Assistance Treaty. Since then Vilnius has been the capital of the Lithuanian SSR and then independent Lithuania. Lithuania refused to have diplomatic relations between Poland and Lithuania until the ultimatum of 1938. Railroad traffic, telegraph lines or even mail could not cross the Polish–Lithuanian border. Lithuania continued to declare Vilnius as its capital in all official documents, including the constitution. Since the city was controlled by Poland, all Lithuanian authorities were transferred to the city of Kaunas, which became the seat of the government. To reconcile reality with
Socialist Party of Lithuania regulated, socially oriented market economy - with the production forces and relations of production the managements goal. Markets in the system - as far as possible, and state regulation - as needed. It considers the principles of state regulation as the best economic development incentive. The LSP ideology was based on the methodology of dialectical materialism, the theory of Marxism and contemporary social science. It believed that Socialists should unambiguously disassociate from Stalinist and totalitarian theories and practice. LSP propagated what it believed to be the new 21st century socialism. Socialist Party of Lithuania Socialist Party of Lithuania () was