Russian President Vladimir Putin and then-ExxonMobil chief executive Rex Tillerson, right, attend a signing ceremony of an agreement between state-controlled Russian oil company Rosneft and Exxon Mobil corporation in 2012. At left is the CEO of Rosneft OAO, Igor Sechin. (AP Photo/RIA-Novosti) Two of President Trump’s most senior cabinet members became embroiled Thursday in an unusual legal battle over whether ExxonMobil under Secretary of State Rex Tillerson’s leadership violated U.S. sanctions against Russia. Treasury officials fined ExxonMobil $2 million Thursday morning for signing eight business agreements in 2014 with Igor Sechin, the chief executive of Rosneft, an energy giant partially owned by the Russian government. The business agreements came less than a month after the United States banned companies from doing business with him. Hours after the fine was announced, Exxon filed a legal complaint against the Treasury Department — naming Treasury Secretary Steven Mnuchin as the lead defendant […]