WHY IT MATTERS The deal aims to restructure one of the United States’deepest adversarial relationships.
“Today, because America negotiated from a position of strength and principle, we have stopped the spread of nuclear weapons in this region.”
— PRESIDENT OBAMA, who has now made major strides toward fundamentally changing the American diplomatic relationships with three formerly hostile nations: Cuba, Iran and Myanmar.
WHY IT MATTERS Israel views a nuclear-armed Iran as a potentially existential threat.
The deal is “a historic mistake for the world” and will allow Iran ‘‘to continue to pursue its aggression and terror in the region.’’
— PRIME MINISTER BENJAMIN NETANYAHU, who has said that a deal will eventually pave the way for Iran to quickly produce multiple bombs and ultimately become a “terrorist nuclear superpower.”
WHY IT MATTERS The deal will lift crippling international sanctions, which have severely depressed the value of the national currency.
— PRESIDENT HASSAN ROUHANI, on Twitter. Mr. Rouhani was elected in 2013 on a platform of ridding the country of sanctions.
WHY IT MATTERS Congress will soon begin reviewing the Iran nuclear deal, but President Obama has said he will veto any vote against it.
“Instead of making the world less dangerous, this ‘deal’ will only embolden Iran – the world’s largest sponsor of terror – by helping stabilize and legitimize its regime.”
— HOUSE SPEAKER JOHN A. BOEHNER, who will help rally public opinion against the deal.
WHY IT MATTERS President Obama may focus on shoring up a Democratic base to sustain a veto, rather than attempting to win over a majority in Congress.
“Who wants their legacy to be a deal that is barely approved by the narrowest of margins and is opposed by the majority of Congress?”
— SENATOR CHRIS COONS, Democrat of Delaware and a member of the Senate Foreign Relations Committee, expressing concern that a rejection of the deal by Congress could become a damaging spectacle. Other Democrats said they would carefully review the agreement before deciding.
WHY IT MATTERS Russia is a longtime supplier of military equipment to Iran.
“We are confident that the world today breathed a sigh of relief.”
— PRESIDENT VLADIMIR V. PUTIN, who emphasized Russia’s plans to be a major partner with Iran in the development of its “exclusively peaceful” nuclear program.
WHY IT MATTERS Iran provides military and financial support to the Syrian government while the United States is arming the rebels who seek to dismantle it.
“We have no doubt that the coming days will see momentum for the constructive role of the Iranian Islamic republic to support the rights of the people and strengthen the bases of peace.”
— PRESIDENT BASHAR AL-ASSAD, according to the Syrian state news service, SANA.