In the wake of the shocking terrorist attacks on Paris, French President Francois Hollande embarked on a round of high-level summitry at the start of the week just past to create an effective new "grand alliance" to defeat Isis. But his venture, already meeting a disappointing "more of the same" response from President Barack Obama in Washington, received an unexpected but timely setback Tuesday when trigger-happy Turkish fighter pilots, flying American-supplied F-16 interceptors, shot down a much slower Russian Su-24 fighter-bomber conducting air strikes against anti-Assad regime Turkmen rebels near the Syria/Turkey border.