New Zealand's foreign minister has welcomed the Iran nuclear deal.

Murray McCully said today the nuclear deal between Iran and six major powers was an "important" breakthrough.

"Over the last eighteen months negotiators have been working to secure an agreement that will increase international confidence in the nature of Iran's nuclear programme," Mr McCully said.

"This agreement is a positive development for regional stability in the Middle East and will allow for further progress to be made in the relationship between New Zealand and Iran.

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"As the current president of the United Nations Security Council, New Zealand will do what it can to expedite any necessary Security Council action, and we call for the agreement to be implemented as soon as possible," he added.

The nearly 100-page accord, announced today, aimed to keep Iran from producing enough material for an atomic weapon for at least 10 years and imposed new provisions for inspections of Iranian facilities, including military sites.

The agreement was expected to lift sanctions in exchange for limits on Iran's nuclear production capability and fuel stockpile.