Historical and realistic reasons for the turmoil in the Balkans so far.

Historical origin: Since the19th century, Russia is eager to open the passage to the southern Mediterranean, Austria tries to expand southward to the Adriatic Sea, and Britain and France want to protect the traffic lifeline to the Indian Ocean and the Far East. As a result, the peninsula has become a region fiercely contested by Russia, Austria, Britain and France, and it has been known as the "European powder magazine" for many times.

Realistic reasons: ethnic groups live together and ethnic conflicts intensify.