Pentagon report on Turkey's F-35 program delivered to Congress

FILE PHOTO: A Lockheed Martin F-35 aircraft is seen at the ILA Air Show in Berlin, Germany, April 25, 2018. REUTERS/Axel Schmidt/File Photo

BERLIN/WASHINGTON (Reuters) - The U.S. Defense Department has delivered a report to Congress detailing implications of Turkey receiving 100 F-35 fighter jets, five people familiar with the report said, removing a key hurdle to concluding the deal.

Turkey's planned purchase of the Russian-made S-400 missile defence system has raised concerns in the West, since it could be used to give Moscow deep insight into the vulnerabilities of the most advanced U.S. warplane at a time of tension between the two powers, experts have said.