washington palatable military options u.s. president donald trump may ultimately choice give diplomacy chance end crisis north korea nuclear missile program though pursue tough economic sanction include oil embargo oppose make concessions might look like appeasement insist pressure regime north korean leader kim jong un need time talk north korea seem even oppose negotiations achieve ability attack continental unite state nuclear weapons north korea interest dialogue ... kim jong un send message last test listen anybody say senior official help coordinate european union north korea policy despite call russia china others push unite state north korea direct talk despite escalate crisis threaten millions live north korea conduct sixth powerful nuclear test last weekend trump administration say unite nations need tighten economic sanction pressure north korea change behavior start talk draft sanction resolution circulate unite nations security council wednesday trump tactics one senior administration official say condition anonymity mirror many business deal simultaneously play good cop bad cop appear interest make deal keep line communication open trump say wednesday call chinese leader xi jinping military action north korea first choice see happen nikki haley u.s. ambassador unite nations say sunday kim beg war add time come us exhaust diplomatic mean late unite state want security council impose oil embargo north korea ban export textiles hire north korean laborers abroad subject leader kim jong un asset freeze travel ban accord draft resolution see reuters wednesday immediately clear draft support north korean ally china along russia denounce late test say resolve nuclear crisis impossible sanction pressure alone l4n1ln25f decade sanction slow north korea nuclear weapons program close goal diplomats analysts say unlikely back u.s. policy strategic patience north korea assume time side economic sanction eventually lead collapse kim jong un regime economy come negotiate table long able withstand economic pain say moon chung-in special adviser south korea president foreign affairs national security however assumption prove wrong north korea economy adapt quickly tighten sanction country also succeed advance nuclear weapons program despite decade economic hardship zhao tong beijing-based north korea expert carnegie-tsinghua center say pyongyang may hope washington ultimately recognize develop credible nuclear capability abandon long-standing precondition talk north korea accept aim nuclear disarmament instead seek freeze nuclear program north korean perspective strategy work say experts say long realistic think north korea trade away nuclear arsenal exchange sanction relief economic support peace treaty unite state end formal state war exist since 1950-53 korean war robert einhorn former senior u.s. non-proliferation specialist brook institution think tank washington say north korea learn u.s. invasion iraq late libyan leader muammar gaddafi decision stop develop weapons mass destruction give critical assets need survival china put forth freeze-for-freeze proposal would suspend large-scale u.s. military exercise south korea return suspension north korean nuclear missile test washington continue reject idea long diplomacy delay great chance north korea master ability hit u.s. mainland nuclear-tipped missiles enter talk position strength south korea keep open option dialogue north korea hop washington seoul develop diplomatic roadmap cho hyun south korea second vice foreign minister say seminar washington tuesday may sound unrealistic today abandon trump seek tough sanction prod north korea negotiations