Ja was North Korea's Permanent Representative to the United Nations between February 2014 and 2018.
He then served as the Director-General of the Department for National Reunification Affairs and Director of the Institute for Disarmament and Peace of the Foreign Ministry of North Korea from 2005 to 2006.
He was a Counsellor at his country's Permanent Mission to the United Nations in New York from 2000 to 2004.
[1] Ja became North Korea's Permanent Representative to the United Nations in February 2014,[1] replacing Sin Son-ho.
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