"Iran never left the nuclear negotiation table, and responded to the entire questions and ambiguities over its nuclear program in the best way possible, and if the talks goes well, the world would realize that our nation is so skillful that can easily overcome its problems through logic," the Iranian president said in a meeting of local cultural and arts figures on Saturday.
In January, Iranian Foreign Minister and top negotiator Mohammad Javad Zarif called on the US officials to stop the policy of pressures against Tehran, adding that the negotiations with the world powers had entered a complicated stage.
"If the Americans want to reach results, they should put an immediate end to the dangerous game of pressuring Iran," Zarif told reporters in Tehran.
On Thursday night, Zarif left a new post on his Twitter account, saying, "We're working hard, but not rushed, to get the job done. Mark my words; you can't change horses in the middle of a stream."
Minutes later, US Secretary of State John Kerry also appeared in front of the cameras in Vienna, and said, "Despite all the agreements we have made so far, some tough issues have remained unresolved."
"These issues should be resolved. And tough decisions should be made," he added, and continued, "We want a deal that stands the test of time."
Kerry said the negotiations are not open-ended, but he didn't say how long the talks would last.