From the Sea of Azov to Aleppo, fighters from the western Balkans are at war. So worried are their governments that laws have been passed to make fighting abroad illegal, and their security services co-operate with foreign ones to monitor them. The numbers are small, but the Balkans looms relatively large on foreign battlefields. Orthodox Christian Serbs are joining pro-Russian rebels in Ukraine while Catholic Croats fight on Ukraine's side. Muslim Albanians, Bosniaks and Muslims from Sandzak, the area straddling Serbia and Montenegro, have gone to fight in Iraq and Syria. All spread their messages online and send greetings to one another. Last month two gloating Croats speaking on YouTube said "Hope to see you soon!" to their Serb "friends". For Serbs and Croats, this war is a replay of their own conflict in the 1990s as much as an adventure or crusade.
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