An enormous western Montana cattle ranch that’s been in the same family for over seven decades and once served as the hideaway for Soviet defector Viktor Belenko is on the market for $21.7 million.

The Vietor family even unknowingly housed Viktor Belenko, a former Soviet Union fighter pilot. In 1976, Belenko defected and flew to Hokkaido, Japan, in a MiG-25, a new, powerful Soviet aircraft ...