unite nations russia accuse unite state deny entry senior military official conduct joint russian chinese brief unite nations thursday criticize u.s. missile defense systems global threat u.s. disarmament ambassador robert wood jeffrey eberhardt state department office multilateral nuclear affairs walk brief within minutes start conference room u.n. headquarter new york alexander emelianov russian defense ministry international cooperation committee say moscow want send delegation lead lieutenant general tretyak andrey russian arm force chief general staff advisers group entry visa give emelianov tell dozen diplomats attend half-hour brief u.s. mission unite nations decline comment individual visa case russian chinese brief russia china long critical u.s. missile defense systems particularly deployment terminal high altitude area defense thaad south korea amid heighten tensions north korea ballistic missile nuclear test russian federation confident unlimited deployment u.s. anti-missile defense serious threat global security unleash arm race threaten entire humanity emelianov tell brief major general zhou shangping deputy director-general operations bureau joint staff department central military commission also brief deployment thaad system little upgrade surveillance capability dprk north korea significantly enhance capability monitor china strategic depth russia far east zhou say china russia repeatedly demand unite state halt deployment thaad south korea russia accuse u.s. deny entry senior military official