Foreign Minister Murray McCully said he thanked US Secretary of State John Kerry today in Washington for his "patient and effective diplomacy" in putting the Iran nuclear deal together.
Mr Kerry in turn thanked New Zealand for its stewardship of the resolution backing the deal unanimously through the UN Security Council, which Mr McCully chaired during the Iran resolution last week.
The deal sets out steps to curb Iran's nuclear weapon-making capacity in return for easing of sanctions imposed by the council.
Mr McCully met Mr Kerry at the State Department this morning - Monday afternoon Washington time.