Israel has denounced the world powers' nuclear agreement with Iran.
Israeli Prime Minister Benjamin Netanyahu on Sunday called the deal a "historic mistake," not a historic agreement.
Another Israeli official said the six-month nuclear accord gives Iran exactly what it wanted - "a significant easing in sanctions and preservation of the most significant parts of its nuclear program."
The agreement between Iran and the group known as the P5+1, consisting of the United States, Britain, China, France, Russia and Germany, was reached early Sunday in Geneva.
Iran's President Hassan Rouhani hailed the nuclear pact with world powers, saying it will "open new horizons," while keeping what he called Iran's right to enrich uranium.
The country's supreme leader, Ayatollah Ali Khamenei, called the agreement the basis for further progress.
The West and Israel fear that Iran has been seeking to develop a nuclear weapons capability, something Iran denies, saying its nuclear program is a peaceful energy project.
Iran has agreed to scale back its uranium and plutonium enrichment, and has agreed to unprecedented inspections to ensure compliance.
Iranian Foreign Minister Mohammad Javad Zarif said the interim deal is an "opportunity to end an unnecessary crisis."
European Union Foreign Policy Chief Catherine Ashton, a key negotiator of the deal, said the intensive talks were done in the "spirit of cooperation" and "mutual respect."
British Foreign Secretary William Hague said the agreement with Iran is an important and encouraging moment in preventing nuclear proliferation in the world.
U.S.,Russian, French, Chinese and German top diplomats also lauded the pact, which they helped create.
U.N. Secretary-General Ban Ki-moon welcomed the pact and urged the governments involved to "do everything possible to build on this encouraging start."