Iran’s foreign minister and the country's chief nuclear negotiator Mohammad Javad Zarif stressed on Sunday that Tehran does not care about a deadline the US Congress has set for a nuclear agreement on Tehran’s peaceful nuclear program.

“We do not care about the (US) Congress deadline. We agreed in Vienna to achieve only solutions until the end of March, not the comprehensive deal,” Zarif told reporters on board a flight en route to Switzerland’s Lausanne for a fresh round of nuclear talks.

The top Iranian diplomat also dismissed the notion of two separate agreements on details and generalities.

“At any circumstances, we should reach an agreement on all details. The next step will be drafting the text of the agreement, but it does not mean that we will have general and detailed deals,” Zarif explained.

Iran and the United States are set to begin a new round of nuclear talks in an effort to bridge their differences and facilitate a comprehensive accord between Tehran and the P5+1 states ahead of a July 1 deadline.

Heading the Iranian nuclear team, Iranian Foreign Minister Mohammad Javad arrived in the Swiss city of Lausanne on Sunday for fresh nuclear talks with the American delegation, led by US Secretary of State John Kerry later in the day.

Deputy foreign ministers of Iran and the US as well as the European Union deputy foreign policy chief, Helga Schmid, are slated to attend the discussions.

Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi and US Energy Secretary Ernest Moniz will also be among the participants in the Lausanne negotiations.

Salehi and Moniz will hold talks later on Sunday. Araqchi and Spokesman for the AEOI Behrouz Kamalvandi will also be present in the talks.