The mystery of the disappearance of Raoul Wallenberg – a Swedish diplomat in the early 1940s credited with saving over 100,000 Hungarian Jews from Nazi death camps by granting them visas – was the responsibility of Sweden, the country's prime minister Göran Persson has said in a meeting with his Israeli counterpart Ariel Sharon on Tuesday. Persson said that his country was maintaining a dialogue with Russia over the fate of Wallenberg, who was imprisoned after World War II by Soviet forces. Sharon held meetings with world leaders and international representatives who have come to Israel for the opening of a new Holocaust museum at Yad Vashem in Jerusalem. Among the leaders in Israel was United Nations Secretary General Kofi Annan, who is married to Wallenberg's niece.