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 to 5.717 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 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).

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