new york france monday give staunch defense iran nuclear deal suggest could talk strengthen pact post-2025 period allow collapse could lead iran neighbor seek atomic weapons essential maintain avoid proliferation period see risk north korea must maintain line french foreign minister jean-yves le drian tell reporters france try convince u.s. president donald trump pertinence choice keep accord even work do complement accord 2025 say speak sideline u.n. general assembly annual gather world leaders new york le drian say collapse deal could lead regional arm race key u.s. ally worry possibility trump effectively pull landmark 2015 nuclear deal iran agree curb nuclear program exchange relief economic sanction le drian also make clear france opposition iraqi kurdish independence referendum say iraq constitution important provision autonomy kurdistan region northern iraq initiatives inappropriate also say five permanent members u.n. security council britain china france russia unite state thursday would discuss possibility contact group syria seventh year civil war france open door strengthen iran nuclear deal post-2025