Iran's president has vowed he will abide by the terms of the preliminary nuclear agreement the country signed with six world powers, so long as they do too.
"The world must know that we do not intend to cheat," Hassan Rouhani said in a televised address to the nation.
But Rouhani warned that Iran would have other options if world powers "one day decide to follow a different path".
The framework deal signed on Thursday will see Iran curb nuclear activities in return for relief from sanctions.
Earlier Israeli Prime Minister Benjamin Netanyahu warned that it posed a grave danger to the region, in particular his own country.
He said any compressive accord, due before 30 June, had to include a "clear and unambiguous Iranian recognition of Israel's right to exist".
But the White House said the US would not sign an agreement over Iran's nuclear programme that would threaten Israel.
White House spokesman Eric Shultz also announced that President Barack Obama would on Friday discuss the framework agreement with Congressional leaders, some of whom have been very sceptical of a deal.
President Rouhani reiterated that Iran's nuclear programme was peaceful.
The country was "not two-faced", he said, and would honour any final deal provided the P5+1 - the US, UK, France, Russia, China and Germany - did the same.
"If the other side acts on its promises, Iran will abide by its promises. If, however, they one day decide to follow a different path, our nation too will be always free to make another choice."
Rouhani also stressed that the world now accepted Iran had the right to enrich uranium on its own soil, and that enrichment was not a threat to anyone.
"Enrichment and all our nuclear technology is merely for the progress of Iran. This enrichment and technology is not against any regional country or the world," he added.
Since 2006, the UN Security Council has adopted six resolutions demanding Iran stop the activity because, while enriched uranium is used as fuel for nuclear reactors and for medical and agricultural purposes, it can also be used to make nuclear bombs.
"Today is a day that will remain in the historic memory of the Iranian nation," Rouhani said.
"Some think that we must either fight the world or surrender to world powers. We say it is neither of those, there is a third way. We can have co-operation with the world."
After the deal was announced on Thursday night, many Iranians took to the streets of Tehran to celebrate and posted messages of support on social media.
Supreme Leader Ayatollah Ali Khamenei, who has the final say on all state matters, has not yet reacted to Thursday's announcement. But hardliners close to him have criticised it.
"To sum up the deal framework in one sentence - we handed over a saddled horse and received a broken bridle in return," Hossein Shariatmadari, one of Ayatollah Khamenei's advisers and editor of the influential hardline newspaper Kayhan, told the Fars news agency.
President Obama said the framework agreement would make the world a safer place, as it would "cut off every pathway that Iran could take to develop a nuclear weapon".
Under the agreement, Iran will cut by more than two-thirds to 5,060 the number of centrifuges it currently operates to enrich uranium. The Fordo underground nuclear facility will remain open for research but will not be used for enrichment.
Iran will also cut its stockpile of low-enriched uranium from around 10 tonnes to 300kg for 15 years, and the design of the heavy-water reactor under construction at Arak will be modified so it produces no weapons-grade plutonium.
In return, UN sanctions and separate measures imposed unilaterally by the US and EU will be gradually suspended as the global nuclear watchdog, the International Atomic Energy Agency (IAEA), confirms Iranian compliance.