Participants in foreign conflicts can receive jail sentences of at least five years.
Jihadists from the region going to fight with ISIL are taking children with them, creating fear and condemnation at home.
Through bilateral, regional and NATO partnerships, Balkan armies support regional safety.
The countries make incremental steps to improving relations.
Participating countries said the exercise increases regional co-operation and supports regional security.
The trial could be one of the most important in Greece's recent history, analysts say.
Following the crash of a MiG-21 fighter jet, Croatia debates if it should partner with another nation as part of NATO's Smart Defence programme, or reinvest in its military.
Citizens and experts urge states to react decisively against ISIL and its propaganda.
Regional countries try to avoid confusion over Russia's attempt to create a new flight region including Crimea and parts of Ukraine.
Better exchange of information will bring closure, according to bloggers.
More than 40 people were arrested in a large operation across Kosovo for recruiting fighters for ISIL and al-Nusra.
The Serbian War Crimes Prosecution ordered an investigation of the military general Dragan Zivanovic, the first general suspected by the Serbian judiciary of command responsibility for war crimes in Kosovo.
Albania announced the first visit by its head of government to Serbia in over half a century.
Armies in the region have been improving their co-operation through joint military medicine activities.
Such images go against the human feelings of everyone, except for the extremists, a Kosovo analyst said.