SEOUL( Reuters)-The U.S. special envoy for North Korea was due to meet his South Korean counterpart on Monday, as the two allies look for ways to entice Pyongyang back to talks over its nuclear weapons and ballistic missile programmes. Sung Kim arrived in Seoul on Saturday for a four-day visit.... He met with Foreign Minister Chung Eui-yong at the minister's residence on Sunday, where they discussed ways for a speedy resumption of the peace process on the Korean peninsula, a foreign ministry of