Speaking to reporters during a joint press conference with Ugandan Minister of State for Foreign Affairs Henry Oryem Okello in Kampala on Tuesday, Zarif said the powers need to recognize the "peaceful nature of Iran's nuclear program" and remove "all the sanctions" and include these two issues in a final nuclear deal.
He underlined the peaceful nature of Iran's nuclear program, and said, "Reaching an agreement is possible."
Zarif stressed Iran's entitlement to the right to use nuclear energy for peaceful purposes based on the Non-Proliferation Treaty (NPT), and said, "We have this technology and no one can take it away from us since this technology has been acquired by our own scientists."
"We try to display the peaceful nature of Iran's nuclear program and give assurances to the world (in this regard)," he added.
The 10th round of negotiations between Iran and the six world powers was held in Vienna from November 18 to 24, where the seven nations decided to extend the talks until July after they failed to strike an agreement.
The latest round of the nuclear talks between the two sides was held at the level of deputy foreign ministers in Geneva, Switzerland, on January 18.
The two sides decided to continue their talk early in February.
Both Iran and the Group 5+1 (the US, Russia, China, Britain and France plus Germany) negotiators have underlined that cutting a final deal before the July 10 deadline is possible.
Senior Iranian negotiator in talks with powers Seyed Abbas Araqchi underlined on Monday that the ongoing negotiations between Iran and the G5+1 are in a critical phase now.
"The Iran-G5+1 talks are at a sensitive stage and the talks will be pursued with a faster momentum in the coming days," Araqchi, also Zarif's deputy, said.
He reiterated that the two sides continued to have differences over some topics.
The senior negotiator stressed that Iran was pursuing the talks with good will and firm resolve, and stressed that the talks would produce desirable results if the western parties showed pragmatism and grew realistic.
"We should see the good will of the (opposite) negotiating sides before a comprehensive agreement can be reached," he added.
The remarks came after the US congress (mostly grabbed by the Republicans) threatened to impose new sanctions against Iran, an issue which has been described as a redline by Tehran in the interim nuclear agreement reached with the world powers in November 2013.
In response Zarif and Parliament Speaker Ali Larijani warned that the Iranian legislature would reciprocate any new US sanctions with intensifying nuclear activities, including enriching uranium to the 60% grade for industrial use.
