The leaders of Japan, China and South Korea plan to issue a joint document next week focused on trilateral cooperation for the denuclearization of North Korea in a "complete, verifiable and irreversible" way, Japanese government sources said Saturday.The proposed document is also expected to include the leaders' commitment to maintain pressure on North Korea and urge Pyongyang to take concrete steps toward abandoning nuclear weapons, the sources said.Japanese Prime Minister Shinzo Abe, Chinese Premier Li Keqiang and South Korean President Moon Jae In are set to meet in Tokyo next Wednesday …READ FULL ARTICLE