ISTANBUL (Reuters) - Russia began delivery of an advanced missile defense system to Turkey on Friday, a move expected to trigger U.S. sanctions against a NATO ally and drive a wedge into the heart of the Western military alliance.
The first parts of the S-400 air defense system were flown to a military air base near the capital Ankara, the Turkish Defense Ministry said, sealing Turkey's deal with Russia which Washington had struggled for months to prevent.
The United States says the Russian military hardware is not compatible with NATO systems and that the acquisition may lead to Ankara's expulsion from an F-35 fighter jet program.
Investors in Turkey have been unsettled by the deal. The Turkish lira weakened as far as 5.728 against the dollar from 5.683 before the ministry announced the arrival of the S-400 consignment to the Murted Air Base, northwest of Ankara. The main Istanbul share index fell 1.4%.
"The delivery of parts belonging to the system will continue in the coming days," Turkey's Defense Industry Directorate said. "Once the system is completely ready, it will begin to be used in a way determined by the relevant authorities."
At least two Russian Air Force AN-124 cargo planes flew to Turkey on Friday morning, data from plane tracking website Flightradar24 showed. Turkish broadcasters showed footage of one plane parked at airbase and a second one landing at around 12.30 pm (0930 GMT).
Russia's Federal Service for Military-Technical Cooperation confirmed on Friday it had started delivering the S-400 systems and that the deliveries would continue in accordance with an agreed schedule, the RIA news agency reported.
An unnamed military-diplomatic source was cited by Russia's TASS news agency as saying a second delivery would be carried out by plane soon. A third delivery – of 120 guided missiles – will be carried out by ship at the end of the summer, the source was quoted as saying.
Twenty Turkish servicemen received training from Russia in May-June and 80 more Turkish servicemen will receive training to use the S-400 system, the source was quoted as saying.
Turkey says the system is a strategic defense requirement, particularly to secure its southern borders with Syria and Iraq. It says that when it made the deal with Russia for the S-400s, the United States and Europe had not presented a viable alternative.
President Tayyip Erdogan said after meeting President Donald Trump at a G20 summit last month that the United States did not plan to impose sanctions on Ankara for buying the S-400s.
Trump said Turkey had not been treated fairly but did not rule out sanctions. U.S. officials said last week the administration still plans to impose sanctions on Turkey.
Under legislation known as Countering America's Adversaries through Sanctions Act (CAATSA), which targets purchases of military equipment from Russia, Trump should select five of 12 possible measures.
These range from banning visas and denying access to the U.S.-based Export-Import Bank, to the harsher options of blocking transactions with the U.S. financial system and denying export licenses.
Washington says the S-400s could compromise its Lockheed Martin F-35 stealth fighter jets, an aircraft Turkey is helping to build and planning to buy.
Turkey could also face expulsion from the F-35 program under the sanctions. Erdogan has dismissed that possibility, but Washington has already started the process of removing Turkey from the program, halting training of Turkish pilots in the United States on the aircraft.
Investors in Turkey have been concerned about the impact of potential U.S. sanctions on an economy which fell into recession after a currency crisis last year.
Turkey's dollar bonds dropped to three-week lows on the news of the delivery, while the cost of insuring exposure to Turkish sovereign debt also rose.
The S-400 acquisition is one of several issues which have frayed ties between the two allies, including a dispute over strategy in Syria east of the Euphrates River, where the United States is allied with Kurdish forces that Turkey views as foes.
The detention of U.S. consular staff in Turkey has also strained relations, along with disagreements over Iran, Venezuela and Middle East policy. Turkey has long demanded Washington hand over a Muslim cleric which Ankara holds responsible for an attempted coup in 2016.
The Murted base was formerly known as Akinci Air Base and was used by putschist soldiers in the failed 2016 coup.