president donald trump face big test world leader meet chinese president xi jinping week summit set tone perhaps consequential u.s. foreign relationships two leaders expect struggle find common grind main issue divide meet thursday friday trump mar-a-lago resort florida main agenda items perhaps trump press national security challenge north korea work develop nuclear-tipped ballistic missiles capable reach unite state trump expect repeat call china rein ally neighbor warn washington might deal pyongyang weapons program alone need china say say unite state de-escalate pyongyang white house strategy review focus options pressure pyongyang economically militarily among measure consideration secondary sanction chinese bank firm business pyongyang long-standing option pre-emptive strike remain table review de-emphasize direct military action senior u.s. official say military action would likely provoke severe north korean retaliation massive casualties south korea japan among u.s. troop station trade trade one big hot-button issue give trump charge presidential campaign chinese trade practice kill u.s. job vow impose 45 percent tariff chinese import administration act unilateral tariff target reduction china 347 billion goods trade surplus tough enforcement trade laws anti-dumping anti-subsidy duties commerce secretary wilbur ross also demand reciprocity u.s.-china economic relationship say u.s. company enjoy access china vast market chinese firm get unite state china say washington create good condition chinese investment unite state want correct imbalance neither side want trade war may hard much low temperature mar-a-lago analysts believe xi may bring package job-creating chinese investments prospect open service sector trump could tweet tangible achievements relations also cloud china expansive claim dispute south china sea beijing build artificial islands instal military facilities u.s. officials see part long-term chinese bid deny u.s. force access strategic sea key global trade route say washington plan robust naval operations challenge chinese claim assert right freedom navigation though months pass since last one october trump predecessor barack obama situation north korea appear push south china sea onto back burner trump expect air u.s. concern trump repeatedly charge china manipulate yuan currency keep export cheap likely raise issue xi trump make good promise formally declare china currency manipulator first day presidency economists believe china push value yuan past china central bank much past two years work prop yuan amid capital outflow pressure spend trillion process would make hard justify manipulator designation u.s. treasury current foreign exchange analysis due one week xi visit summit would happen trump reaffirm one china policy underpin relations decades trump infuriate beijing president-elect take call taiwan president suggest might abide policy backtrack call xi february xi may look head big new weapons package taiwan u.s. officials tell reuters craft part taiwan watch anxiously sign trump use bargain chip factbox issue stake trump-china summit florida