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Iran's president said before departing for New York that he would "firmly defend" his country's positions at the U.N. General Assembly.
Iran on Sunday threatened a "more painful" response to U.S. strikes on three Iranian oil tankers.
Iran responded to a warning from President Trump with claims of new strikes against U.S. forces in Kuwait and the United Arab Emirates.
U.S. forces announced new strikes against targets linked to Iran's Revolutionary Guard, marking another round of attacks as the U.S. and Iran return to hostilities.
As the war passes the six-month mark, neither side showed any sign of backing down.
As U.S. economic pressure bites, Iran touts a plan with Oman to get ships moving through the Strait of Hormuz and suggests the next move is Trump's.
Iran's economy minister said the country has been preparing for a long time for the sanctions U.S. Treasury Secretary Scott Bessent described as the "greatest financial offensive" ever.
The new head of Iran's supreme national security council issued the warning to countries who join the U.S.'s economic war on Tehran.
President Trump said Wednesday the U.S. might return to negotiations with Iran eventually, but he said currently "the situation is so good."
The 60-day deadline for the U.S. and Iran to negotiate a peace deal and reopen the Strait of Hormuz expired, with no agreement in sight.
A vote in the Senate to limit President Trump's war powers has narrowly failed again. Three Republicans voted in favor of it.
Iran launched multiple ballistic missiles at U.S. forces in the Middle East in what U.S. Central Command described as an "attempted surprise attack" on Tuesday.
The U.S. moves more refueling planes to the Mideast and adds medics at a major military hospital as the war with Iran spreads to another key waterway.
Two U.S. service members were killed earlier in Jordan and a third was missing in action, the U.S. Central Command said.
Iran said it would attack "all infrastructure in the region" if President Trump follows through on his threats to attack Iranian civilian infrastructure.