Gennady Timchenko, the billionaire Russian gas trader hit with U.S. sanctions over his alleged ties with the Kremlin following Russia's annexation of Crimea, said being singled out by Washington was a badge of honor. But Timchenko, who sold his stake in oil trading firm Gunvor last month, acknowledged that the sanctions were slightly inconveniencing his business interests because some European banks were reluctant to deal with him.