Crowds turned out at Tehran's Mehrabad Airport to give a hero's welcome to the country's nuclear negotiating team, after they clinched a deal with world powers in Geneva.
The deal curbs the Iranian nuclear program in exchange for initial sanctions relief.
Together they chanted "No war, no sanctions, no insults and no submission."
Posters of President Hassan Rouhani were held high; some claim he is the architect behind diplomatic detente.
The agreement halts Iran's most sensitive nuclear activity -- its higher-grade enrichment of uranium.
The interim deal is the first step in reducing decades of tension between Tehran and Western powers.