Early in his career, this politician resided in Norway with his wife, the socialite Carlota Thorkildsen, and lived on a remote island in Oslo fjord, which is described in his memoirs told to Léo Lania. While serving as chair of the Independent Com- mission on International Development Issues, he released a report titled "North-South: A Programme for Survival" in which he proposed that a line could be drawn at roughly 30 degrees North latitude to separate rich and poor nations. Jerzy Buzek unveiled a monument honoring this man's "Kniefall von Warschau," in which he knelt down at a monument to the Warsaw Ghetto Uprising. This politician recognized his country's eastern border at the Oder-Neisse line. After it was revealed that his personal aide Gunter Guillaume had been an East German spy, 
Early in his career, this politician resided in Norway with his wife, the socialite Carlota Thorkildsen, and lived on a remote island in Oslo fjord, which is described in his memoirs told to Léo Lania. While serving as chair of the Independent Com- mission on International Development Issues, he released a report titled "North-South: A Programme for Survival" in which he proposed that a line could be drawn at roughly 30 degrees North latitude to separate rich and poor nations. Jerzy Buzek unveiled a monument honoring this man's "Kniefall von Warschau," in which he knelt down at a monument to the Warsaw Ghetto Uprising. This politician recognized his country's eastern border at the Oder-Neisse line. After it was revealed that his personal aide Gunter Guillaume had been an East German spy, this man retired and was replaced by Helmut Schmidt. For 10 points, name this this socialist West German chancellor, known for implementing the policy of Ostpolitik.