In October 1973, during the Yom Kippur War, Sweden's Minister for Foreign Affairs Krister Wickman criticized Israel and said the problems in the Middle East could not be solved by military superiority. In June 1981, Sweden condemned Israel's attack on the Osirak nuclear reactor in Iraq as a "clear violation of international law". In July 1982, after Israel's invasion of Lebanon, Prime Minister Olof Palme compared Israel's treatment of Palestinian children to Nazi Germany's treatment of Jewish children in the Nazi concentration camps and ghettos of World War II. In December 1988, Palestine Liberation Organization chairman Yasser Arafat visited Stockholm by invitation of the Swedish government. After two days of negotiations, Arafat announced that he would now accept Israel's right to exist and he denounced all forms of terrorism.