Mohammad Javad Zarif said in Vienna on Wednesday that Iran is prepared to take solid steps to guarantee that its nuclear program is solely used for peaceful purposes.

The top nuclear negotiator added that Iran remains committed to end the “unnecessary crisis” over its peaceful nuclear program, adding, “To those who continue to believe that sanctions brought Iran to the negotiating table, I can only say that pressure has been tried for the past 8 years, in fact for the past 35 years. It didn’t bring the Iranian people to kneel in submission. And it will not now nor in the future.”

Representatives from Iran and the six world powers – the US, the UK, France, Germany, China, and Russia – are currently in Austria’s Vienna to strike a comprehensive nuclear deal over Iran’s nuclear energy program.

The current round of talks, which Zarif has described as a unique opportunity to make history, is expected to last until July 20.

Iran and the six countries have been discussing ways to iron out their differences to achieve a final deal that would end the decade-old dispute over Tehran’s nuclear energy program.

The two sides inked an interim accord in Geneva, Switzerland, on November 23, 2013. Under the deal, the six countries agreed to provide Iran with some sanctions relief in exchange for Iran agreeing to limit certain aspects of its nuclear activities during a six-month period. The deal expires on July 20 but can be extended depending on the agreement of all parties involved.

Mohammad Javad Zarif and Catherine meeting is a prologue to set the axes of this round of talks.

On the document drafted in the previous round in Vienna, Zarif told reporters that it would not definitely be said that there was a jointly-agreed text. “Agreement would be on only parts of a text; however, in the majority of cases, differences are in content and the manner of drafting the agreement,” Zarif was quoted to say.

This round of talks is reportedly the most complex, technical, and at the same time, longest round, where both sides are resolved to bring the negotiations to a concrete result.

The high profile negotiations are expected to continue until at least July 15.

Michael Mann, spokesperson for the EU foreign policy, says both Iran and the major powers should show seriousness to narrow differences in order to strike a final deal.

“Both sides will have to come determined to narrow the differences,” Mann told the Tehran Times and Mehr News Agency.

The two sides have set July 20 as the deadline to reach a final deal.

Mann said the European Union trio (Britain, Germany and France) along with the U.S., Russia and China were working hard to make the talks bear fruit.

“The E3/EU+3 is determined to reach a comprehensive agreement,” he noted.

The spokesman also claimed there were “no” differences between the six powers in their approach toward Iran.

He also refused to comment on differences between Iran and the major powers on the content of the final deal. “We do not talk publicly about the content of the negotiations.”

He also confirmed reports that the Western countries in six-nation group want Iran cut down the number of uranium centrifuges in operation, saying, “That will be part of the negotiations.”

He made the remarks in a ceremony to celebrate the Mining and Industry Day.

Sanctions have already been eased and Tehran is committed to reach a conclusion out of its nuclear talks with the world powers, president added.

He promised to facilitate private sectorsˈ interactions with the world and support their investment.

Referring to the investorsˈ problems during the eight years of hardliner Mahmoud Ahmadinejadˈs presidency, Rouhani noted that its administration is keen to open a new chapter in governmentˈs collaboration with the private sectors.

President Rouhani pointed to the geopolitical situation of Iran as well as its rich natural resources, underlining that the government is determined to reduce inflation rate and make an economic boom.