seoul north korea leader kim jong un say nuclear weapons powerful deterrent guarantee sovereignty state media report sunday hours u.s. president donald trump say one thing work deal isolate country trump make clear refer comment seem suggestion military action mind speech meet powerful central committee rule workers party saturday day trump recent comment state media say kim address complicate international situation north korea nuclear weapons powerful deterrent firmly safeguard peace security korean peninsula northeast asia kim say refer protract nuclear threats u.s. imperialists recent weeks north korea launch two missiles japan conduct sixth nuclear test may fast advance toward goal develop nuclear-tipped missile capable hit u.s. mainland north korea prepare test-launch missile russian lawmaker return visit pyongyang quote say friday donald trump previously say unite state would totally destroy north korea necessary protect ally situation prove north korea policy byungjin mean parallel development nuclear weapons economy absolutely right kim jong un say speech national economy grow strength year despite escalate sanction say kim refer u.n. security council resolutions put place curb pyongyang nuclear missile program meet also handle personnel change inside north korea secretive opaque rule center power state media say kim jong un sister kim yo jong make alternate member politburo top decision-making body kim jong un preside alongside kim jong un promotion make kim yo jong millennial member influential body new position indicate 28-year-old become replacement kim jong un aunt kim kyong hui key decision maker former leader kim jong il alive show portfolio writ far substantive previously believe consolidation kim family power say michael madden north korea expert johns hopkins university 38 north website january u.s. treasury blacklist kim yo jong along north korean officials severe human right abuse kim jong sik ri pyong chol two three men behind kim ban rocket program also promote state media announce several high rank cadres promote central committee south korean unification ministry say could attempt north korea navigate way increase isolation large-scale personnel reshuffle reflect kim jong un take current situation seriously look breakthrough promote new generation politicians ministry say statement north korea foreign minister ri yong ho name donald trump president evil bombastic speech u.n. general assembly last month promote full vote-carrying member politburo ri safely identify one north korea top policy makers say madden even informal record meet ri interlocutors assure whatever proposals proffer take directly top say kim jong un praise nuclear program promote sister