Israel's Prime Minister Benjamin Netanyahu has called the nuclear deal with Iran "an historic mistake" and said it has "made the world a much more dangerous place".
He said that the international community appeared to have switched position in not calling for a complete end to all uranium enrichment, and accused Iran of taking "cosmetic steps which it could reverse easily within a few weeks".
"Without continued pressure [on Iran], what incentive does the regime have to take serious steps which actually dismantle its nuclear weapons capability?"
"Israel is not bound by this agreement," he added.
When you consider the diplomatic mountain the US and Iran have already scaled, you get a daunting sense of the challenge ahead.
The deal between Iran and world powers looks like a breakthrough, but with six months of wrangling over details ahead, it could still fail.
The nuclear agreement between Western powers and Iran was broadly welcomed by politicians, former world leaders and Middle East experts.