SYDNEY (Reuters) - Papua New Guinea Prime Minister Peter O'Neill urged Asia-Pacific nations to increase their participation in the World Trade Organisation (WTO) on Friday, five days after a tense regional summit held in the Pacific nation ended in acrimony.Deep divisions between the United States and China over trade and investment stymied cooperation at the Asia-Pacific Economic Cooperation forum (APEC), leaving the 21 member nations unable to issue a traditional joint communique on shared..