The Iranian 9th Tactical Aviation Base recently hosted an unusual visitor: the prototype of the Russian Su-57 aircraft.

The Su-27 in the Crosshairs The first designs of what ... However, development of the warplane was slow going, and the prototype didn't make its maiden flight until May 1977.

“Air defense systems shot down a Su-27 aircraft of the Ukrainian Air Force ... However, development of the warplane was slow going, and the prototype didn’t make its maiden flight until ...