washington three u.s. aircraft carrier strike group exercise together western pacific come days rare show force president donald trump visit asia warn nuclear threat north korea u.s. officials say drill include uss nimitz ronald reagan theodore roosevelt accompany warships first time three u.s. aircraft carrier strike group exercise together region decade japanese destroyer inazuma join armada two japanese government officials say follow separate three-day exercise reagan two indian warships sea japan end monday u.s. officials previously say drill consideration plan way decision soon go forward exercise western pacific previously publish four u.s. officials two japanese source discuss drill reuters speak condition anonymity disclose precise date location exercise pentagon navy pacific fleet decline comment future operations reuters aware plan trump visit carriers trump reiterate tough rhetoric north korea nuclear missile program since start 12-day trip asia sunday speak tokyo monday trump renew warn era strategic patience north korea u.s. leader begin visit south korea tuesday rattle ally vow totally destroy north korea necessary defend unite state ally dismissal north korean leader kim jong un rocket man suicide mission kim call trump mentally derange u.s. dotard last time three u.s. carrier strike group exercise together 2007 nimitz along john c. stennis kitty hawk carrier strike group participate drill near guam large-scale drill serve potent reminder u.s. ability rapidly mobilize military force capability trump administration keen emphasize pyongyang race ahead test build nuclear-tipped missile capable strike unite state since take office trump vow expand fleet u.s. carriers even military strategists experts believe massive ship would increasingly vulnerable modern chinese russian weapons conflict singapore-based military expert tim huxley say presence u.s. carriers still send unmistakable message one carry 70-odd aircraft beyond capability project military power great range ability project political psychological power arguably unmatched see play say huxley international institute strategic study war china u.s. carriers might vulnerable conflict north korea ... three u.s. carriers deliver tremendous amount airpower carrier commanders say strike group keep combat ready time jet fighters surveillance plan fly constantly flight deck maintain protective screen u.s. defense officials note recently presence three u.s. carriers region reassure ally even though long schedule demonstrate capability nation world joint staff director lieutenant general kenneth mckenzie jr say early month chinese foreign ministry spokeswoman hua chunying call restraint regular news brief tuesday ask carriers say situation korean peninsula complex severe relevant side exercise restraint avoid irritate dedicate low tense situation peninsula time make positive efforts get north korean nuclear issue back track resolution via talk soon possible hua say reiterate long-held chinese position cia say north korea could months away develop ability hit unite state nuclear weapons scenario trump vow prevent u.s. defense secretary jim mattis trip late last month south korea pain stress diplomacy america prefer course get north korea give nuclear weapons still warn pyongyang military match u.s.-south korean alliance diplomacy effective back credible military force u.s. stage drill three carriers trump visit asia