Oil rises after U.S. threat of sanctions on Venezuela crude

LONDON (Reuters) - Oil rose on Thursday, shaking off persistent concern about the outlook for demand after the U.S. government said it could impose sanctions on OPEC member Venezuela's crude exports.Venezuela's opposition leader Juan Guaido declared himself interim president on Wednesday, winning backing from Washington and parts of Latin America and prompting socialist Nicolas Maduro, the country's leader since 2013, to break relations with the United States.Economic crisis under Maduro has..