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
National symbols of Lithuania his capital. The Iron Wolf Mechanised Infantry Brigade ("motorizuotoji pėstininkų brigada 'Geležinis vilkas"') is now the core unit of the Lithuanian Army. The bear is an ancient symbol of Samogitia, one of the regions of Lithuania, and appears in the coat of arms of Šiauliai district. A moose is shown in the Lazdijai district municipality coat of arms and the aurochs is featured in the Kaunas coat of arms. The national plant is rue ("rūta"). A bride traditionally wears a little crown made of rue, which is a symbol of maidenhood. During the wedding the crown is burned, symbolizing the