Iran got something in return for the drone technologies and the factories they helped us build in Tatarstan. Its very racist to believe the Iranians are some kind of idiots that gave us some stuff for free because they like us. Iranians were always very cautious in dealings and cooperation, do you remember what kind of scandal they made when we said that we are using their base in Hamadan? Probably thats why they didnt want to sign an agreement like the one we sign with North Korea few months before the one we signed with them.
As for sanctions, we have waaay more than Iran have, thats from 2022, a lot of more were put on us since than.