seoul north korea condemn internationally conduct powerful nuclear test yet across border south korean president moon jae-in also attract flak policy pursue engagement pyongyang rebuke u.s. president donald trump moon face grow call home change course take tough line north korea even core support base young liberals accord hundreds comment post online moon sweep power win may election remain hugely popular policy pursue pressure dialogue north scrutiny trump blunt situation face south korea one washington big ally asia south korea find tell talk appeasement north korea work north korea understand one thing say tweet sunday nuclear test within south korea doubt moonshine policy engage north grow recent weeks change pace north ballistic missile test since moon take office north twice test-fired intercontinental ballistic missiles july despite international warn conduct sixth powerful nuclear test sunday say dialogue north north conduct nuclear test keep word say post facebook page presidential blue house user name kim bojoong moon say campaign presidency dialogue would impossible quite time north go ahead another nuclear test however moon indicate sunday national security council meet give use pressure bring north negotiate table sentiment repeat monday telephone call japan prime minister shinzo abe pressure must strengthen north come table dialogue presidential blue house quote moon tell abe moon trump speak phone late monday blue house say two agree time apply strong sanction pressure north korea strong sanction would pursue unite nations another post palace facebook page user shin sanggyun say know things tough mister president response north nuclear pursuit rather feeble time south korea start consider use shipbuilding expertise build nuclear submarine junior aircraft carriers shin say facebook post among hundreds similar message leave official social media maintain monitor blue house include twitter account country large naver.com web portal sentiment express south korea social media users predominantly people 20s 30s barometer political support moon former human right lawyer sweep power anti-graft movement bring predecessor park geun-hye moon support rat slip slightly recent days remain hugely popular public opinion survey realmeter poll agency conduct two days sunday nuclear test release monday show support moon fell 0.8 percentage point week ago 73.1 percent support among youngsters strong moon get 85 percent approval rat among people 20s south korea conservative opposition party say moon government expectations north korea unrealistic isolate country ally moon jae-in government make appeasement gesture haggle dialogue despite north continue provocations become nuclear hostage senior liberal korea party member kim tae-heum say monday moon push dialogue bind hit dead end pyongyang never really consider south dialogue partner say kim jun-seok political diplomacy professor dongguk university seoul acknowledge us partner talk north korea want talk unite state kim say south korea 's moon face call alter policy north korea nuclear test