"The success of this diplomatic process depends on the seriousness and good faith of the opposing side, refraining from excessive demands and unlawful requests, and the acceptance of Iran's legitimate rights and interests," Esmaeil Baqaei wrote on X.

Top-level peace talks between the United States and Iran entered a second day early on Sunday.

Vice President JD Vance became the highest-ranking American to meet directly with Iranian officials since the 1979 Islamic revolution, days after the United States and Israel halted their war that had plunged the Middle East and the global economy into tumult.

"Discussions were held over the past 24 hours on various aspects of the main issues of the negotiations, including the Strait of Hormuz, the nuclear issue, war reparations, the lifting of sanctions, and the complete end of the war against Iran and in the region," Baqaei wrote.

He said Iran was "determined to use all means, including diplomacy, to secure national interests and safeguard the country's interests".