Exxon Mobil Corp. has applied to the Treasury Department for a waiver from U.S. sanctions on Russia in a bid to resume its joint venture with state oil giant PAO Rosneft, according to people familiar with the matter. Exxon has been seeking U.S. permission to drill with Rosneft in several areas banned by sanctions and applied in recent months for a waiver to proceed in the Black Sea, according to these people. The…