Japan's prime minister is urging Iran's leaders to play a constructive role in securing peace in the Middle East and to abide by the 2015 nuclear deal.
Shinzo Abe has warned of accidental conflict in the region, during his two-day visit to Tehran.
But President Hassan Rouhani also had this message for the US: waging economic war on Iran would not make it capitulate.
Tokyo is a close US ally and was also a major buyer of Iranian oil before Washington imposed sanctions aimed at Iran's energy industry.
Abe hopes to end the standoff between the US and Iran,
Al Jazeera's Dorsa Jabbari reports from Tehran