The Nov. 24 downing of an intruding Russian bomber by Turkish jet fighters produced understandable anger in Moscow. A trace of Cold War-era angst spread throughout the civilized world. The incident had Cold War echoes. Russia lacks the Soviet Union's armed might, but has nuclear weapons. Last year its bullyboy president, Vladimir Putin, shook the Kremlin's nuclear saber at Eastern Europe. Turkey is a NATO member. NATO was formed to stymie Soviet aggression. Violation of a member's territory by an armed aggressor does not immediately commit the rest of NATO to combat, but it guarantees an alliance response. The U.S....