Iran is ready for "just" negotiations but not if they mean surrender, Iran's President Hassan Rouhani said on Wednesday, without saying what talks he had in mind.

Rouhani seemed to be referring to possible negotiations with the United States. U.S. President Donald Trump withdrew from a landmark 2015 nuclear deal with Iran last year but has said he is willing to hold talks with the Islamic Republic.

"As long as I have the responsibility for the executive duties of the country, we are completely ready for just, legal and honest negotiations to solve the problems," Rouhani said, according to his official website.

"But at the same time we are not ready to sit at the table of surrender under the name of negotiations."

Iran's reduction of commitments under nuclear deal is temporary and can return to the previous situation if other parties uphold their commitments under the deal, Rouhani said, adding if negotiations with remaining signatories of nuclear deal don't reach a result, Iran will take the third step in reducing its commitments under the deal at the end of the 60-day period.

Iran will attend a meeting in Vienna on Sunday at the level of deputy ministers and political directors from countries still party to the 2015 nuclear deal.

"It was agreed to convene an extraordinary meeting of the JCPOA joint commission in Vienna on July 28," Iran's Foreign Ministry said on Tuesday, using the acronym for the deal's formal name, the Joint Comprehensive Plan of Action.

Rouhani said on July 14, Iran is ready to hold talks with the U.S. if Washington lifts sanctions and returns to the 2015 nuclear deal.

"We have always believed in talks... if they lift sanctions, end the imposed economic pressure and return to the deal, we are ready to hold talks with America today, right now and anywhere," he said.