Canada is and has been a strong supporter of multilateralism. The country is one of the world's leading peacekeepers, sending soldiers under the U.N. authority around the world. Canadian former Minister of Foreign Affairs and subsequent Prime Minister, Lester B. Pearson, is credited for his contributions to modern international peacekeeping, for which he won the Nobel Peace Prize in 1957. Canada is committed to disarmament, and is especially noted for its leadership in the 1997 Convention in Ottawa on the prohibition of the use, stockpiling, production and transfer of anti-personnel mines.