INTELLIGENCE: Big-Mouth Belenko

Soviet jet experts faced a serious problem: despite the use of grain alcohol, an old but effective deicer, the windshields of MIG-25 Foxbat interceptors were icing up. What had gone wrong? The answer, according to Lieut. Viktor Ivanovich Belenko: Soviet crew chiefs on the ground were drinking the grain alcohol to relieve Siberian boredom and surreptitiously replacing the liquid with water.

That is only one of the fascinating tidbits about the Soviet air force that U.S. intelligence debriefers have gleaned from Belenko since the 29-year-old defecting pilot flew his Foxbat to northern Japan's...