By Christian Lowe MOSCOW (Reuters) - Russia called on Friday for Washington to restart direct military-to-military cooperation to avert "unintended incidents" near Syria, at a time when U.S. officials say Moscow is building up forces to protect President Bashar al-Assad's government. The United States is leading a campaign of air strikes against Islamic State fighters in Syrian air space, and a greater Russian presence would raise the prospect of the Cold War superpower foes encountering each other on the battlefield. Both Moscow and Washington say their enemy is Islamic State.
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