seoul summer fill flame rocket earth-shaking nuclear blast north korea state media portray kim jong un leader temporarily trade weapons workshops new portrayal appear design build domestic support deliver promise develop economy alongside nuclear program reassure citizens amid tighten international sanction state media photos release wednesday show kim examine equipment tractor factory test drive one vehicles laugh workers late stream photos past two months depict smile kim visit farm factories make shoe cosmetics truck june 21 sept. 20 kim conduct single public activity relate economy instead focus almost exclusively appearances events include missile test tour weapons factories accord data collect south korea ministry unification resumption public economic-related activities coincide lull missile test north korea fire rocket test nuclear weapon since launch ballistic missile japan sept. 15. break test match lull similar time past years north korea almost certainly continue push capable nuclear weapons south korean officials say renew focus economic development could bid unify north koreans strengthen support leadership say baik tae-hyun spokesman south korea unification ministry north korea still show continue develop nuclear missile program focus economy also help north korean people come together baik say north korea may start feel pinch sanction tighten sixth powerful nuclear test september leadership could pressure limit impact say nam sung-wook professor north korean study korea university seoul kim jong un simply best encourage people achieve rapid economic growth boost production nam say take care economy people top priorities since take rein reclusive regime death father end 2011 kim embrace goal simultaneously purse economic development advance nuclear weapons new u.n. security council sanction august september ban import coal textiles seafood restrict oil shipments north north korean officials say state media sanction cause colossal amount damage ordinary north koreans leaders show defiance argue self-reliance overcome international pressure main key foil extremely vicious sanction pressure u.s. imperialists vassal force turn misfortune bless self-reliance sci-tech strength kim say oct. speech leaders rule workers party korea accord state media benjamin katzeff silberstein researcher foreign policy research institute track north korea economy say push expand manufacture decrease reliance import wide range goods north korea also look expand export products cover sanction tractors silberstein add analysts say anecdotal evidence sanction begin north economy clear degree price petrol diesel spike cost foods like corn rice remain relatively stable accord reuters analysis market data collect defector-run daily nk website north korea 's kim trade missiles tractors test lull