Pulling from the innards of my mind all my ancient military aviation knowledge, I believe it's pretty well-established that an SU-27 is superior to an F-15 in terms of maneuverability. Also, the SU-27 looks practically nothing like the F-15.
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Well I didn't mean the SU-27 is based off the F-15 but rather the SU just looks very similar to some of our aircraft.