Planes SU-35 are also used in Syria. Russians have been making a lot of noise about their SU-35C, which is 4++ generation plane. It’s their newest plane used in air-force beside the fifth generation PAK FA which is expected to enter Russian air-force in late 2016 or early 2017.
Americans’ opinion about SU-35
I think SU planes are excellent given their relatively low cost in comparison to American planes.
By the way the original designer of legendary Su (Sukhoi) planes was a Belarusian Pavel Sukhoi.