Welcome back to the our channel for the reason why the US hides so many rare and powerful Soviet warplanes. Would it be to train your pilots in realistic scenarios? Back in the Vietnam War, the US Navy and Air Force were having a really hard time combating the latest Mig variant. They managed to capture one and found out what its capabilities came up with effective tactics. I was stationed in Alaska for 4 years and Iceland for 2. Cold weather does some strange things to everything! I retired after serving 24 years in the Air Force. Retired 20 years ago. Was stationed in places where my boots would literally melt on top of the aircraft and hit 71 below zero in Alaska! That was with no wind chill so that was the actual temp! Around 1997 or so we broke a record where we went 21 straight days where it never got WARMER than 40 below. Obviously, by the comments, many already knew about this. I've known about it since I was a child and I am 53 now. Soviet/Russian aircraft have also been used in Aggressor Squadron for training of US pilots decades ago. Not a very big secret. Also - this is something that many countries do or have done in the past. The aircraft are not hidden. They are used for evaluation and in training exercises. You can even see them when you visit airbases. They are not rare aircraft, but production series aircraft (versus test or pre-production). But I guess you could say that they are rare in the US, because there's only a handful, not many as you state.