which became the seat of the government. To reconcile reality with constitutional claims, Kaunas was designated as a temporary or provisional capital until Vilnius would be "liberated from Polish occupation". In March 1938, Lithuania accepted a Polish ultimatum, demanding diplomatic relations. Despite normalised relations, the new Lithuanian Constitution, in May 1938, still claimed Vilnius as the de jure capital of Lithuania, and Kaunas remained as the temporary capital. See also History of Lithuania History of Vilnius History of Lithuania (1918–1940) History of Kaunas Former national capitals