US President Donald Trump left South Korea today for Washington after a trip to Asia that took in a G20 summit in Japan and a historic meeting with North Korean leader Kim Jong Un in the Demilitarized Zone, DMZ of Korean peninsula.<br />''<br />''Mr Trump shared a symbolic handshake with North Korean leader Kim Jong-un at the Demilitarised Zone. He became the first US President to cross into North Korea after meeting Mr Kim at the DMZ. <br />