In a historic move, US Secretary of State John Kerry and his Iranian counterpart have met one-on-one, a thawing of ties that raised hopes of a breakthrough in the foes' nuclear stand-off.
The brief encounter, one of the highest-level between the two foes since Iran's 1979 Revolution, came as world powers hailed a fresh impetus in nuclear talks with Iran, which have made little progress for years.
Kerry said he and his counterparts from the great power contact group known as the P5+1 praised Mohammad Javad Zarif's presentation "which was very different in tone, and very different in the vision that he held out with respect to the possibilities in the future."
The top US diplomat said he had met with Zarif, who took up his post in August, "on a side meeting in which we took a moment to explore a little further the possibilities of how to proceed."
It was an extraordinary contact between the two countries which have had no diplomatic relations since 1980, when Iranian students stormed the US embassy in Tehran and embarked on a prolonged hostage-taking.
Kerry said the two men had agreed to try to find a "concrete" way to "answer the questions that people have about Iran's nuclear program."
Zarif, whose country still refers to the United States as the "Great Satan," also hailed his talks with the P5+1 as "very substantive."
He and Kerry had stressed "the need to continue these discussions to give it the political impetus that it requires and to hopefully to reach a conclusion within a reasonable time," he said.
Chaired by EU foreign policy chief Catherine Ashton, the meeting brought together the foreign ministers of the five permanent members of the UN Security Council, Britain, China, France, Russia and the United States plus Germany.
Smiling broadly, Zarif was seen sitting at the head of the table next to Ashton looking down on a Security Council conference room, with Kerry to the right on an abutting table.
But western powers have approached with caution the overtures made by the new Iranian leadership which took power in August.
And Kerry said "needless to say one meeting and a change in tone, which was welcome, doesn't answer" all the questions on Iran's nuclear program.
"There's a lot of work to be done," he stressed.
The brief encounter, one of the highest-level between the two foes since Iran's 1979 Revolution, came as world powers hailed a fresh impetus in nuclear talks with Iran, which have made little progress for years.
Kerry said he and his counterparts from the great power contact group known as the P5+1 praised Mohammad Javad Zarif's presentation "which was very different in tone, and very different in the vision that he held out with respect to the possibilities in the future."
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The nuclear talks will now resume on October 15 and 16, boosting hopes that Iran will bring tangible proposals to the table on how to move forward as the west seeks to rein in its nuclear program.
The top US diplomat said he had met with Zarif, who took up his post in August, "on a side meeting in which we took a moment to explore a little further the possibilities of how to proceed."
It was an extraordinary contact between the two countries which have had no diplomatic relations since 1980, when Iranian students stormed the US embassy in Tehran and embarked on a prolonged hostage-taking.
Kerry said the two men had agreed to try to find a "concrete" way to "answer the questions that people have about Iran's nuclear program."
Zarif, whose country still refers to the United States as the "Great Satan," also hailed his talks with the P5+1 as "very substantive."
He and Kerry had stressed "the need to continue these discussions to give it the political impetus that it requires and to hopefully to reach a conclusion within a reasonable time," he said.
Chaired by EU foreign policy chief Catherine Ashton, the meeting brought together the foreign ministers of the five permanent members of the UN Security Council, Britain, China, France, Russia and the United States plus Germany.
Smiling broadly, Zarif was seen sitting at the head of the table next to Ashton looking down on a Security Council conference room, with Kerry to the right on an abutting table.
But western powers have approached with caution the overtures made by the new Iranian leadership which took power in August.
And Kerry said "needless to say one meeting and a change in tone, which was welcome, doesn't answer" all the questions on Iran's nuclear program.
"There's a lot of work to be done," he stressed.