As South Korea heads for a snap presidential election on Jun 3, frontrunner Lee Jae-myung is signalling a return to diplomacy with Pyongyang - and greater caution on entanglement in US-China tensions, says professor of political science Robert Kelly. BUSAN: South Korea’s most recent conservative president, Yoon Suk Yeol, has been impeached and removed . Mr Yoon declared martial law without warning on Dec 3, pitching the country into a major constitutional crisis. Not since South Korea was a