berlin unite state terminate iran nuclear deal reimpose sanction tehran could result iran develop nuclear weapons raise danger war close europe germany foreign minister say saturday u.s. president donald trump refuse friday formally certify tehran comply 2015 accord even though international inspectors say warn might ultimately terminate agreement german foreign minister sigmar gabriel tell deutschlandfunk radio trump send difficult dangerous signal u.s. administration also deal north korea nuclear crisis big concern happen iran iran u.s. perspective remain iranian issue many others world consider whether acquire nuclear weapons give agreements destroy gabriel say children grandchildren grow dangerous world say say unite state terminate deal sanction reimpose tehran would give iranian hardliners negotiations west upper hand might revert develop nuclear weapons gabriel say add israel would tolerate back 10 12 years ago danger war relatively close europe urge unite state endanger security ally people domestic policy reason hail trump predecessor barack obama key stop iran build nuclear bomb deal also sign china france russia britain germany european union european ally warn split washington nuclear agreement say put limbo undermine u.s. credibility abroad trump give u.s. congress 60 days decide whether reinstate economic sanction iran lift 2016. danger war germany warn trump 's move iran nuclear deal