Viktor Belenko. Public Domain Lieutenant Viktor Belenko decided he had had enough.

Despite being considered an expert fighter pilot with one of the Soviet Union’s elite squadrons, with all the perks that went with it, Belenko was tired of the shortages and propaganda that defined much of life in the USSR.

He feared that reports of plenty in the US were also exaggerated, but he decided to take a chance. On September 6, 1976 during a routine training mission, he switched off his radio and bolted to Hakodate airport in Japan.

After nearly running out of fuel, barely avoiding a civilian jetliner, and overshooting the runway, he set down in Japan with only a busted landing gear.

It turned out to be one of the great intelligence coups of the Cold War.

Given this gift, including a flight manual that Belenko had helpfully brought along, Western intelligence agencies proceeded to tear the plane to bits analyzing the fighter whose capabilities up until now were only an assumption.

When the Soviet Union demanded its return, Japan agreed on the condition that they recoup shipping costs. The plane showed up at a docked Soviet vessel in dozens of crates, and when the Soviets realized at least 20 key components were missing, they demanded $10 million in compensation. As befitted the Cold War, neither ever paid.

The MiG-25 “Foxbat” was the newest and most advanced fighter the Soviet Union possessed. The United States and its allied NATO countries were genuinely concerned over its capabilities, and it was generally assumed to be an advanced fighter bomber that could outfly anything NATO had.

Nothing could be farther from the truth. The Mig-25 was very cutting edge in its way. It was one of the fastest fighters ever produced, with a theoretical top speed of mach 3.2 at the risk of engine damage, putting it near the vaunted US SR-71 spy plane. Its radar was one of the most powerful ever put on a plane of its size.

But those strengths were where it ended. The MiG-25 was built around its extremely heavy engines, and it showed. It had a ridiculously short combat range, and even its unarmed cruising range was too short, as Belenko’s journey could attest.

It was so specialized in high-altitude interception that flying it at low altitude and speed could be very difficult. It could not carry weapons for ground attack, did not have an integral cannon, and the large wings NATO interpreted as making it a formidable dogfighter were simply meant to keep its heavy airframe in the air.

In reality, it was maneuverable and would be mincemeat in a conventional dogfight once it closed to short range. Its electronics were still vacuum tube technology, and its airframe would literally bend itself out of shape if the pilot was not careful. It was made to be a high speed missile carrier targeting bombers or US high-altitude reconnaissance aircraft like the U-2 inside Soviet airspace, and not much more.

Despite its flaws, the Soviet Union built over a thousand of them, and it was widely exported to a number of countries, where its combat record in several wars was mixed at best. An updated version called the MiG-31 was later built that shared aspects with the original, including many of its shortcomings.

Belenko, for all his doubts, received a welcome beyond his skeptical hopes. In an old saw that applied to many Soviet visitors, he was flabbergasted by his first visit to an American supermarket, and wondered if it was a CIA hoax. He was granted citizenship by an act of Congress in 1980, and he co-wrote an autobiography called MiG Pilot that had some success.

He reportedly works as an aerospace engineer to this day. His daring escape still stands as one of the defining moments of the Cold War.