Turkey has been given a deadline of the end of July to choose between buying US fighter jets and Russian anti-aircraft missile systems.

Acting US Defence Secretary Patrick Shanahan set out the ultimatum in a letter to his Turkish counterpart, Hulusi Akar.

Turkey, he said, could not have both America’s F-35 advanced fighter jets and Russia’s S-400 systems.

The two Nato allies have been locked in a row over the S-400 for months.

America argues that the Russian systems are both incompatible with Nato defence systems and pose a security threat, and wants Turkey to buy its Patriot anti-aircraft systems instead.

Turkey, which has been pursuing an increasingly independent defence policy, has signed up to buying 100 F-35s, and has invested heavily in the F-35 programme, with Turkish companies producing 937 of the plane’s parts.

What consequences does Turkey face?

Mr Shanahan says in his letter that the US is “disappointed” to hear that Turkish personnel have been sent to Russia to train on the S-400.

“Turkey will not receive the F-35 if Turkey takes delivery of the S-400,” he writes. “You still have the option to change course on the S-400.”

The letter includes a schedule for winding down Turkish participation in F-35 pilot training.

“We do not want to have the F-35 in close proximity to the S-400 over a period of time because of the ability to understand the profile of the F-35 on that particular piece of equipment,” US Under Secretary of Defence Ellen Lord told reporters.

The first four F-35s due to be delivered to Turkey have still not left the US, officially to allow Turkish pilots to train in them in America.

Turkish President Recep Tayyip Erdogan said on Tuesday his country was “determined” to proceed with the S-400 deal.

“Unfortunately we haven’t received a positive proposal from the American side on the subject of Patriots like the S-400s from Russia,” he said.

Turkey has the second-largest army in Nato, a 29-member military alliance set up to defend against what was at the time the Soviet Union.

The head of Russia’s state defence conglomerate Rostec, Sergei Chemezov, was quoted as saying on Friday that Russia would start delivering the S-400 to Turkey in “about two months”.

What is the S-400 system?

The S-400 “Triumf” is one of the most sophisticated surface-to-air missile systems in the world.

It has a range of 400km (250 miles), and one S-400 integrated system can shoot down up to 80 targets simultaneously.

Russia says it can hit aerial targets ranging from low-flying drones to aircraft flying at various altitudes and long-range missiles.

How does the S-400 work?

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