Crisis meeting in Paris comes as France begins reconnaissance flights over Iraq and UK edges closer to military action

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A senior western source told the Guardian that Saudi Arabia felt so threatened by Isis that it was prepared to act in a frontline role. "There is a very real possibility that we could have the Saudi air force bombing targets inside Syria. That is a remarkable development, and something the US would be very pleased to see."

Another senior official said Saudi Arabia was far more willing to play an open role in the offensive against Isis than it did during the 1991 Gulf war and the 2003 invasion of Iraq. On those campaigns, Riyadh allowed its military bases to be used by US forces, but did not commit its service personnel. This time, Riyadh sees Isis as a direct threat.

"They actually see themselves as the real target," the official said. "They know that they have to step up, and they are ready to, from what we can see."
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