One of the problems that emerges when U.S. officials and the news media are focused on a small number of foreign-policy issues is that troubling developments can occur below the radar in other areas. That appears to be happening in the Balkans, a region that was a foreign-policy priority of the Western powers in the 1990s, but which has faded to near invisibility in recent years. While American policymakers and opinion leaders obsess about the Middle East, North Korea and every minutia concerning President Trump and his alleged Russia connections, tensions in the Balkans are simmering and threaten to reach a boil.

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