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
Office of the Chief Archivist of Lithuania Lithuania. Its main functions are to: Office of the Chief Archivist of Lithuania The Office of the Chief Archivist of Lithuania is a government agency, which participates in the shaping of national policy in the field of management and use of documents and archives, as well as implements this policy, supports the Chief Archivist of Lithuania in the carrying-out of state administration of the field of documents and archives. The emergence of archives in Lithuania is associated with the formation of the Lithuanian state in the first half of the 13th century. The old Lithuanian chancery archives of Grand Duke