ExxonMobil and Iran did business under Secretary of State nominee Tillerson while country under U.S. Sanctions
The transactions included $53.2 millions in sales to Iran over three years. Company said they were legal because they were conducted by a European subsidiary. Ref. USAToday.
I think this is further evidence the Trump administration isn't in Russia's pocket nor is Rex Tillerson. I also have to believe that with all the anti Russian things President Trump has done lately if the Russians had been working with his campaign they'd have leaked the info to discredit him.