zurich european countries utmost preserve deal limit iran nuclear program despite misgive u.s. president donald trump senior european union diplomat say wednesday bilateral agreement multilateral agreement europeans everything make sure stay helga schmid secretary general eu foreign policy service tell iranian investment conference switzerland financial capital deal broke 2015 bloc iran unite state france germany britain russia china trump weigh whether pact serve u.s. security interest face oct. 15 deadline certify iran comply decision could sink agreement strongly support world power negotiate schmid say europe concern iran role regional affairs issue part nuclear accord know joint comprehensive plan action absolutely convince good place address issue ditch jcpoa schmid say world need second nuclear proliferation crisis one already many add apparent reference washington standoff north korea nicholas hopton britain ambassador iran say u.n. nuclear watchdog report show iran fully comply term accord hope president trump recertify deal u.s. continue play constructive important role implementation jcpoa tell conference u.s. defense secretary jim mattis say tuesday unite state consider stay iran deal unless prove tehran abide agreement u.s. national interest although mattis say support trump review agreement defense secretary view far positive trump call deal agree iran six world power embarrassment europe everything preserve iran nuclear deal eu diplomat