for using Nazi forced labor." In 1938 Prince Franz Josef II became the first prince of Liechtenstein to take up permanent residence in Liechtenstein. He ruled from Vaduz until his death in 1989. During World War II, Liechtenstein remained neutral, while family treasures within the war zone were brought to Liechtenstein (and London) for safekeeping. At the close of the conflict, Czechoslovakia and Poland, acting to seize what they considered to be German possessions, expropriated the entirety of the Liechtenstein dynasty's hereditary lands and possessions in Bohemia, Moravia, and Silesia — the princes of Liechtenstein lived in Vienna until the Anschluss of 1938. The expropriations (subject to modern legal dispute at the International Court of Justice) included over of agricultural and forest land (most notably the UNESCO listed Lednice–Valtice Cultural Landscape), and several family castles and palaces. Citizens of Liechtenstein were also forbidden from entering Czechoslovakia during the Cold War. Liechtenstein gave asylum to approximately five-hundred soldiers of the First Russian National Army (a collaborationist Russian force within the German Wehrmacht) at the close of World War II. This is commemorated by a monument at the border town of Hinterschellenberg which is marked on the country's tourist map. The act of granting asylum was no small matter as the country was poor and had difficulty feeding and caring for such a large group of refugees. Eventually, Argentina agreed to permanently resettle the asylum seekers. In contrast, the British repatriated the Russians who fought on the side of Germany to the USSR, where they were summarily treated as traitors and most of them executed, including their families. The Post-War era Since World War II (in which Liechtenstein remained neutral) the country's low taxes have spurred outstanding economic growth. Liechtenstein became increasingly important as a financial center. In dire financial straits following the war, the Liechtenstein dynasty often resorted to selling family artistic treasures, including for instance the portrait "Ginevra de' Benci" by Leonardo da Vinci, which was purchased by the National Gallery of Art of the United States in 1967. Liechtenstein prospered, however, during the decades following, as its economy modernized with the advantage of low corporate tax rates which drew many companies to the country. Liechtenstein became increasingly important as a financial center. In 1989, Prince Hans-Adam II succeeded his father to the throne, and in 1996, Russia returned the Liechtenstein family's archives, ending a long-running dispute between the two