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Kuwaiti Prime Minister Sheikh Ahmad al-Abdullah al-Sabah inspecting the damaged airport in Kuwait. [AFP].

Iran's president insisted on Wednesday that the United States will achieve nothing with its sanctions campaign after Washington laid out plans to collapse the country's economy.

Almost six months into their war, the two sides are locked in a stalemate, with Iran keeping the key Strait of Hormuz shut and Washington persisting with a naval counter-blockade of Iran.

Under political pressure at home over the impacts of the conflict, US President Donald Trump has pivoted away from military action to economic levers, expanding sanctions and warning of consequences for countries that do not join.