[Turkish Cypriot leader Mustafa Akinci, left, speaks with Greek Cypriot President Nicos Anastasiades, right, next to Special Adviser to the United Nations Secretary-General on Cyprus Espen Barth Eide, 2nd right, and Elizabeth Spehar, Deputy to the Secretary-General's Special Adviser on Cyprus, 2nd left, during the Cyprus Talks, in Mont Pelerin, Switzerland Sunday, Nov. 20, 2016. (Jean-Christophe Bott/Keystone via AP)]NICOSIA, Cyprus (AP) — United Nations Secretary General Ban Ki-moon appealed to Cyprus' rival Greek and Turkish Cypriot leaders not to let a 'historic opportunity' to reunify the ethnically divided island slip away, Ban's spokesman said Wednesday, after pivotal talks at a Swiss resort hit an impasse.