Su-35 Flanker-E. I think it's the 2 seat trainer version, the S-35UB. Edit: no it's not, it's the Su-27UB Flanker-C. I think. Edit again: the exhibition stand was taken by Frank Turbines. They are plugging the maiden flight of a Su-27UB. https://www.frankturbine.com/en/index.html
Su-35 Flanker-E. I think it's the 2 seat trainer version, the S-35UB. Edit: no it's not, it's the Su-27UB Flanker-C. I think. Edit again: the exhibition stand was taken by Frank Turbines. They are plugging the maiden flight of a Su-27UB. https://www.frankturbine.com/en/index.html