The seemingly calm European situation is not really calm; any slight interference from a force could completely disrupt Europe's tranquillity.
It proves that the title of the Balkan Peninsula as a powder keg is not exaggerated. Carlo originally thought the European situation would maintain a brief peace, but unexpectedly, a small incident on the Balkan Peninsula almost triggered a war between two major powers.
The matter had to start from the previous Russian-Turkish War. Although the Russians won the war, Austria-Hungary and the United Kingdom intervened, successfully replacing Russia as the beneficiary of the war.
This left Emperor Alexander III of Russia quite aggrieved. His meticulously planned war not only didn't bring Russia a large amount of territory and population but also failed Russia's expansion on the Balkan Peninsula.
