sentences:  Prime Minister Dr. Manmohan Singh paid an official visit to Seoul from 24–27 March 2012, pertaining to Nuclear Security Summits, which led to the deepening of bilateral strategic partnership that was forged during President Lee Myung-bak’s State visit to India.An agreement on visa simplification was signed on 25 March 2012 in the presence of the two leaders at the Blue House.A Joint Statement was also issued during the PM's visit.