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The US is set to sell advanced F-15 fighter jets to Saudi Arabia. Image Credit: Bloomberg

Washington: The Obama administration will soon notify Congress of an arms sale to Saudi Arabia worth up to $60 billion, US officials said, a potentially record-breaking deal that may help counter Iran's growing regional muscle.

A senior US defence official, speaking on condition of anonymity, said he expected the Saudis to initially commit to $30 billion to upgrade their fleet of aircraft, but that could double. Still, the final figure was unclear.

"At this point in time, we can't estimate how much of that $60 billion (the Saudis) will make it to, but in any world this is an enormous arms package," another US official said.

The deal will be a major boost to Boeing Co, which is expected to supply the Saudis with 84 new F-15 fighter jets and upgrade another 70 of them. It also included 70 of Boeing's Apache attack helicopters and 36 of its AH-6M Little Birds.

Saudi Arabia would buy 72 Black Hawk helicopters built by Sikorsky Aircraft, a unit of United Technologies Corp. "It's massive," said Andrew Exum, an analyst at the Center for a New American Security, calling the long-anticipated deal a "shot-in-the-arm" for the US defense industry.

"What the United States is trying to do here is pretty clear. (It is) basically trying to work by, with and through our partners in the region to balance against Iran," he said.

A US defence official said he did not expect much pushback from lawmakers, who have 30 days to object to the deal following formal notification, expected this week or next. Congress is aware of the need to bolster allies in the face of the Iranian threat, he said.

"I think that if you look at the kingdom, the major threat that they face emanates from Iran and this gives them a whole host of defensive capabilities to defend the kingdom."

Israel is also "fairly comfortable" its qualitative military edge would not be jeopardized by the Saudi package, the official added, speaking on condition he not be named.

State Department spokesman P.J. Crowley said: "The United States would do nothing that would upset the current balance (of power) in the region."

More missile defence

US and international concern about Iran's growing military capability includes advances in a nuclear programme the West believes is aimed at developing atomic weapons - accusations Tehran denies.

"Much like we're having with all of our Gulf allies, we're having conversations with the Saudis about what array of ballistic missile defence capabilities they're going to need to protect the kingdom," the official said. But those talks are at a pretty early stage," one official said on the condition he not be named.

Any future missile defense sales would come on top of the up to $60 billion aircraft package. US officials are also discussing a possible deal to upgrade Saudi Arabia's navy.

One official estimated any future navy deal could be worth $30 billion, but another said it was too soon to say.