Turkey's Defence Minister Hulusi Akar talks to acting U.S. Secretary of Defense Patrick Shanahan during a NATO defence ministers meeting at the Alliance headquarters in Brussels, Belgium February 13, 2019. REUTERS/Francois Lenoir - RC18F6D62DA0

Ankara plays down US ultimatum on S-400

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Turkey's Defence Minister Hulusi Akar talks to acting U.S. Secretary of Defense Patrick Shanahan during a NATO defence ministers meeting at the Alliance headquarters in Brussels, Belgium February 13, 2019. REUTERS/Francois Lenoir - RC18F6D62DA0

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