there is no civilian aviation sanctions related to Iran nuclear programs , the sanctions on his sector are far older than this nuclear circus.
and sadly RR use American equipment in their engines ,unless they are willing to design a brand new engine just for Iran.
the situation with RR engines are exactly like Tu-214 deal , it come with 3 engine
Aviadvigatel PS-90A that nobody want as it don't meet some necessary standard on noise level and had a 40% higher maintenance need.
Rolls-Royce RB211-535E4 that seems to use some American technology as it was originally designed for Boeing 757 and it seems that boeing had some say in its newer version (exactly RB214-535E4)
Aviadvigatel PS-90A2 which uses technology from Pratt & Wittney
we wanted RB214-535E4 or PS-90A2 and USA sanction stopped that deal
b the way there is a rumor that Russian designed PS90-A3 engine without American component because USA stopped a major deal with IranAir-Tour right now they have build 76 of Tu-204/214 and our order was 200 of Tu-214