The United States is disturbed by Russia's movement of tactical aircraft to Syria, U.S. Secretary of State John Kerry said Saturday, acknowledging that the jets could pose a threat to American and allied military forces.

U.S. officials say Russia moved a small number of fighter jets to a base in Syria on Friday, hours after U.S. Defense Secretary Ash Carter talked with Russia Defense Minister Sergei Shoigu in the first military contacts between the two countries in some time.

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