if russian and chinese leadership were more global in their thinking, and better strategists in the new great game, they'd involve their diplomatic and technical corps more proactively in the iran-nuclear situation. should that dilemma be resolved without armed conflict, and with the removal of un sanctions, iran would become, immediately, both a potential fulcrum for politico/economic leverage in the region and an ideal market for a variety of military hardware packages, including, and especially, a order of 4 to 4++ gen multi-role combat aircraft. under present circumstances, russia is best positioned to exploit this market as the chinese military aircraft inductry is hobbled by lagging turbofan development and production issues.
simply put, in the very near term, iran could potentially be a market for ~ 200 - 250 su-35/mk2.
in the longer term, iran could potentially be a market for ~ 200 - 250 fc-20.