beijing whether president-elect donald trump go deployment u.s. anti-missile system south korea key indicator political tie unfold china source tie leadership beijing say beijing also keep close eye trump meet thursday prime minister shinzo abe japan key regional rival clue president-elect never hold public office likely conduct foreign policy say south korea unite state agree deploy terminal high altitude area defence thaad anti-missile system counter missile threats north korea expect place within eight 10 months commander u.s. force south korea say early month china argue plan deployment undermine strategic stability northeast asia worry thaad powerful radar provide coverage china missile installations whether deployment terminal high altitude area defense delay political weather vane one source say security adviser trump say last week meet new york abe thursday may mark start talk garner tokyo support push-back china grow influence asia hear say watch say source request anonymity authorize speak media play ear source say invoke idiom translate block punch kick come trump create doubt commitment security alliances japan south korea suggest need pay u.s. military presence even hint develop nuclear weapons capability japan go nuclear would china bad nightmare likely provoke strong reaction diplomats analysts say china relations japan long poison beijing see tokyo failure fully atone invasion occupation part china world war two well compete claim group east china sea islets northeast asia would powder keg second source say refer nuclearized sub-region include china japan north south korea state council information office cabinet spokesman office immediate comment china generally oppose military alliances see cold war relics china stability-obsessed leaders know make 70-year-old trump whose win hillary clinton unexpected backpedal controversial campaign statements example trump pledge commitment defend south korea exist security alliance phone call last week south korean president park geun-hye trump say election campaign would will withdraw 28,500 u.s. troop station south korea unless seoul pay great share cost u.s. deployment trump tell reuters interview may will talk north korean leader kim jong un try stop pyongyang nuclear program major shift u.s. policy toward isolate nation also call china rein pyongyang sino-u.s. relations trump take office jan. 20 expect fluid although chinese president xi jinping tell trump telephone call monday cooperation correct choice two giants statement trump presidential transition office say two men establish clear sense mutual respect one another believe two countries one strong relationships move forward trump election offer good news china signal demise u.s.-led trans-pacific partnership tpp exclude china raise possibility belated u.s. back china-led asian infrastructure investment bank possibly mark end president obama strategic pivot asia bad news trump often make provocative remark china campaign include threats slap 45 percent tariff import china label world second-biggest economy currency manipulator wei jianguo retire vice commerce minister optimistic trade war could avoid protectionism rise trade war china unite state unlikely wei vice chairman china center international economic exchange government-backed think-tank tell reuters election rhetoric say china see thaad deployment 'weather vane trump