China called on the United States to show “sincerity” in resolving the Iranian nuclear issue while sounding a warning about Japan’s discussion of possessing nuclear weapons in a recent official report.The assessments appeared in China’s latest National Report on the Implementation of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), which the Ministry of Foreign Affairs released on Monday.The document outlines Beijing’s progress in nuclear disarmament and its long-standing nuclear...