The reason? Syria was hosting the leader of the Kurdish guerrilla group (miliitant?) PKK. Turkey demanded that Syria hand over Mr. Ocelan, otherwise, the threat went, we're going to come in there and take him by force. 50,000 troops searching for one wanted terrorist can leave a large mark on a nation. Syria should know as it did the same to its own people when it razed and leveled the city of Hama, killing somewhere between 10,000 and 20,000 of its own citizens. Syria capitulated to Turkey's demands. This is the same Turkey that claims right to critize Israel for defending its own borders against ceaseless rocket attacks.
French investigators confirm wing part is from Flight MH370 (AP)
from the article: Israel accuses Turkish PM of inciting anti-Semitism