Abbas Araghchi said Iran would respond more strongly than before and defend itself with greater force if its enemies resorted to military confrontation again. (EPA Images pic)

TEHRAN: Iran's top diplomat insisted on Sunday that there would be no military solution to the United States' war against the Islamic republic, with talks on ending the conflict apparently at an impasse.

A campaign of heavy bombardment failed to bring a decisive close to the war launched by the US and Israel in late February, and Washington in recent weeks has dialled back military operations in favour of economic pressure.

The main point of contention remains Iran's attempt to blockade the Strait of Hormuz, a vital conduit for Gulf oil and gas where a UK maritime agency reported on Sunday another tanker was struck by an unknown projectile.