Wait a minute, isn't this the 21st? Chronologically, it is. But last Friday, Russia -- like the mad scientist Emmett Brown in "Back to the Future" -- thrust us backward by about 150 years in the Caucasus: into the age of imperialism and geopolitics, resource wars and spheres of influence.

It was strictly 19th-century when Russian Prime Minister Vladimir Putin casually announced that "war has started." In the old days, such pronunciamentos were routine; war, to recall Clausewitz, was just the "continuation of politics with...