u.s. president donald trump agree honor longstanding one china policy phone call chinese president xi jinping major diplomatic boost beijing brook criticism claim neighbor taiwan follow major developments u.s.-sino relations since trump u.s. presidential election november dec trump speak phone president tsai ing-wen taiwan move likely infuriate china consider self-ruled island complicate u.s. relations beijing china lodge swift protest blame taiwan petty move dec 11 trump say unite state necessarily stick long-standing position taiwan part one china question nearly four decades u.s. policy dec 12 china express serious concern trump say unite state necessarily stick long-held stance taiwan part one china dec 14 veil warn trump china ambassador unite state say beijing never bargain washington issue involve national sovereignty territorial integrity jan 11 taiwan scramble jet navy ship group chinese warships lead sole aircraft carrier sail taiwan strait late sign heighten tension beijing island jan 12 trump nominee secretary state rex tillerson say china deny access islands build contest south china sea describe place military assets akin russia take crimea ukraine feb china top diplomat yang jiechi tell michael flynn trump national security advisor china hop work unite state manage control dispute sensitive problems feb trump break ice xi letter say look forward work develop relations feb trump change tack agree honor one china policy phone call xi timeline trump question honor `` one china `` policy