Wall Street Journal: A Turkish warplane shot down a Syrian helicopter that had violated Turkish airspace Monday, underlining the regional combustibility of Syria's conflict despite a week of frenzied international diplomacy…Turkey, one of Syrian President Bashar al-Assad's fiercest critics, has had its calls for a Kosovo-style military intervention into Syria to provoke regime change ignored, and has grown frustrated over what it sees as Western indecisiveness.

Financial Times: Its downing is only the latest in a long stream of bloody incidents involving Syria and Turkey along a chaotic and often bloody 900km border. But it also comes at a time when international military tensions had appeared to diminish after Damascus's apparent acceptance of a deal to put its chemical weapons arsenal beyond use. To date, none of the fatal incidents across the Syrian-Turkish border has led to a serious escalation.