A handout photo released by the Turkish Presidential Press Office shows Turkish President Recep Tayyip Erdogan (R) shaking hands with Russian President Vladimir Putin during a joint press conference after their meeting at the Presidential Complex in Ankara on December 11, 2017.

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Turkish President Recep Tayyip Erdogan has said that a deal to purchase Russian S-400 air defense systems will be finalized by the end of the week.

Erdogan made the remark following a meeting with Russian President Vladimir Putin in Ankara on Monday.

S-400, whose full name is the Triumf Mobile Multiple Anti-Aircraft Missile System (AAMS), is an advanced Russian missile system designed to detect, track, and destroy planes, drones, or missiles as far as 402 kilometers away. It has previously been sold only to China and India.

Under the deal, Russia will send two S-400 systems to Turkey within the next year and then help the country domestically produce two more batteries. The deal is said to be worth around $2.5 billion.

Putin noted that Turkish and Russian officials will be meeting shortly to complete the deal, and that “perspectives for wider military and technical cooperation were also discussed during his meeting with Erdogan.