US Secretary of Defense Jim Mattis and his Qatari counterpart Khalid al-Attiyah signed a letter of agreement on Wednesday for a $12-billion sale of US-manufactured F-15 fighters, the Pentagon said. The sale comes amid a simmering crisis in the Gulf after Qatar's neighbors accused it of supporting terrorism and cut diplomatic ties. US President Donald Trump has signalled his support for the Saudi-led move but other US officials have been more cautious and called for dialogue to end the crisis.



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