Economy South Korea, US to work closely on summit after Pyongyang's about-face Updated : May 20, 2018 01:05 PM IST Moon and Trump spoke over the phone for about 20 minutes, and exchanged their views on North Korea's recent reactions, South Korea's presidential office said without elaborating. Although a historic inter-Korean summit in late April raised hopes of reconciliation, North Korea showed a dramatic change in tone in recent days. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.