The specter of pressure points from Ukraine to North Korea raises a disturbing question. Is the U.S. prepared for a multi-front war? That’s not an esoteric, theoretical abstraction. Conflict can break out anywhere opposing forces face one another, often when not expected. Washington now is financing fighting forces in dozens of countries and promising to run to the rescue of more if they too are sucked into war. Two of these wars are more than sporadic struggles between guerrilla forces. Ukraine