Loud statement ... the F-15 fighter jet. Photo: Reuters

HONOLULU: Fortifying one of its key allies in the Persian Gulf, the Obama administration announced a weapons deal with Saudi Arabia on Thursday, saying it had agreed to sell F-15 fighter jets valued at nearly $US30 billion to the Royal Saudi Air Force.

The agreement, and plans to press ahead with a nearly $US11 billion arms deal for Iraq, is evidence of its determination to project American military influence in an oil-rich region shadowed by a threat from Iran.

Though the White House said the deal had not been accelerated to respond to threats by Iranian officials in recent days to shut off the Strait of Hormuz, it comes as tensions with Iran have deepened and the US has withdrawn its last soldiers from Iraq