Russian Ambassador Sergey Kislyak arrives ahead of  an address by President Donald Trump to a joint session of Congress on February 28, 2017.

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Russia: Change of ambassador has been planned for some time

Kislyak has been at the center of a political firestorm in the US

Atlanta CNN  — 

Russian Ambassador Sergey Kislyak left the United States for Russia on Saturday after concluding his tour of service as ambassador to the US, a spokesman for the Russian Embassy said,