The Wall Street Journal | Ann M. Simmons: President Vladimir Putin’s new pact with Turkey expands Moscow’s role as a power broker in the Middle East, again showing his skill at building up Russia’s sway while weakening U.S. influence.

This time, he secured a deal with Turkish President Recep Tayyip Erdogan to shore up Turkey’s efforts to establish a buffer zone along the border with neighboring Syria, driving a wedge between ankara and its allies in NATO and drawing the country closer to the Kremlin. Turkey on Wednesday said it permanently halted its...

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