The Western Balkan countries have emerged as a frontline in Russia's geopolitical confrontation with the West. These nations—Armenia, Bosnia and Herzegovina, Georgia, Moldova, and Serbia—have been termed by academics at the Carnegie Endowment for International Peace as "in-between" countries set in an "arc of instability." But what exactly does this mean, and how much of a threat does Russia pose?
Click through the following gallery and learn more about this complex geopolitical situation that could endanger these five states and destabilize the European Union.