SYDNEY (AP) — Southeast Asian leaders and Australia's prime minister have called on North Korea to end its nuclear program and are urging United Nations countries to fully implement sanctions. Leaders attending the first summit of the Association of South East Asian Nations, known as ASEAN, to be held in Australia issued a joint statement with Australia on Sunday that also calls for non-militarization and a code of conduct in the contested waters of the South China Sea, where China has become increasingly assertive. Tensions between the U.S.