beijing china say monday hop iran nuclear deal stay intact play important role keep peace senior u.s. official say president donald trump expect decertify agreement official speak last week condition anonymity say trump also expect roll broad u.s. strategy iran would confrontational trump administration frequently criticize iran conduct middle east trump call pact embarrassment bad deal ever negotiate weigh whether serve u.s. security interest face oct. 15 deadline certify iran comply term speak beijing chinese foreign ministry spokeswoman hua chunying say iran nuclear deal good example solve something peacefully talk agreement play positive important role ensure nuclear non-proliferation protect peace stability middle east add hope comprehensive iran nuclear agreement continue earnestly implement hua tell daily news brief iranian authorities repeatedly say tehran would first violate accord iran agree restrict nuclear program return lift international sanction cripple economy trump decline certify iran compliance u.s. congressional leaders would 60 days decide whether reimpose sanction tehran suspend agreement prospect washington could renege pact sign unite state britain france germany russia china european union iran worry u.s. ally china close economic diplomatic tie tehran also instrumental push landmark 2015 deal china say hop iran nuclear deal stay intact amid trump criticism