NATO exercise Steadfast Javelin II showed that the safety of member states will not be compromised, experts said.
Serbia is ready to participate in the fight against ISIL, Serbian Prime Minister Aleksandar Vucic said.
Kosovo officials said the country continues to act as a constructive member of the international community.
Extremist statements have authorities concerned about ethnic strife.
The efforts coincide with government calls for lesser sentences but bigger fines.
Government action against the participation of local citizens in ISIL is crucial for the regional fight against terrorism, experts say.
Intelligence co-operation leads to boy's repatriation from an ISIL camp in Syria.
Greece is an important partner to Serbia in developing its capacities for multi-national operations, EU integration and military education.
Washington is helping Serbia assume a new role as a training centre for international forces.
Regional countries participate in NATO cyber-security and other joint projects.
By joining the international coalition against ISIL, the Balkan countries are moving towards regional co-operation to fight terrorism.
Regional countries seek ways to show NATO their achievements and the need for Alliance membership.
Montenegro's parliament is expected to adopt a law introducing penalties for citizens who take part in foreign armed conflicts.
Authorities arrested 12 imams and continue to monitor radicals that may pose a threat to security.
The NATO member state provides technical assistance and training to Ukrainian intelligence agencies.