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FAIRFORD, ENGLAND - JULY 01:  A F-35B aircraft approaches a KC-130J Super Hercules aircraft to re-fuel as it flies over the North Sea having taken off from RAF Fairford on July 1, 2016 in Gloucestershire, England. On Wednesday, the first of Britain's F-35B Lightning II jets was flown by RAF pilot Squadron Leader Hugh Nichols, on its first transatlantic crossing, accompanied by two United States Marine Corps F-35B aircraft from their training base at Beaufort, South Carolina. The combined US/UK team of aircrew and engineers are here in the UK to demonstrate just what the 5th generation state of the art aircraft can do, flying at the Royal International Air Tattoo and Farnborough International Air Show over the next few weeks. The aircraft are due to enter service with the Royal Navy and RAF from 2018.  (Photo by Matt Cardy/Getty Images)
FAIRFORD, ENGLAND - JULY 01:  A F-35B aircraft approaches a KC-130J Super Hercules aircraft to re-fuel as it flies over the North Sea having taken off from RAF Fairford on July 1, 2016 in Gloucestershire, England. On Wednesday, the first of Britain's F-35B Lightning II jets was flown by RAF pilot Squadron Leader Hugh Nichols, on its first transatlantic crossing, accompanied by two United States Marine Corps F-35B aircraft from their training base at Beaufort, South Carolina. The combined US/UK team of aircrew and engineers are here in the UK to demonstrate just what the 5th generation state of the art aircraft can do, flying at the Royal International Air Tattoo and Farnborough International Air Show over the next few weeks. The aircraft are due to enter service with the Royal Navy and RAF from 2018.  (Photo by Matt Cardy/Getty Images)

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Russia condemns US downing of Syrian warplane

Russia threatens to treat US jets in Syria as targets after the US shot down a Syrian warplane. CNN's Barbara Starr reports.