From Aviation Week:
Two Sukhoi Su-27UB trainers have just turned up in the US. They're probably not the first aircraft of the type to be acquired by US operators - but are probably the first that anyone will talk about, since there have been multiple Su-27 sightings in the neighborhood of Air Force Flight Test Center Detachment 3, popularly known as Area 51.
The two new arrivals have been acquired from the Ukraine by Reno-based Tac Air, which provides training and test support to the military. (The company was involved with testing of Raytheon's hush-hush LSRS radar, for instance.) They arrived some months ago in suburban Rockport, Illinois, in the hold of an An-124 cargo aircraft, and are being overhauled and modified (with US radios, for example) by warbird specialist Pride Air. The company says that the work is nearing completion.
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My Comment: The F-22s now have the real thing to shoot at in air combat exercises.