South Korea maintains diplomatic relations with more than 188 countries. The country has also been a member of the United Nations since 1991, when it became a member state at the same time as North Korea. On 1 January 2007, former South Korean Foreign Minister Ban Ki-moon served as UN Secretary-General from 2007 to 2016. It has also developed links with the Association of Southeast Asian Nations as both a member of ''ASEAN Plus three,'' a body of observers, and the East Asia Summit (EAS).