U.S. President Donald Trump has decided to step up a sanctions campaign on Venezuela’s oil sector and will be more aggressive in punishing people and companies that violate it, the top U.S. envoy to the Latin American country said on Monday. Washington and dozens of other countries say Venezuela’s opposition leader Juan Guaido is the legitimate president, and the administration has been trying to oust socialist President Nicolas Maduro. Maduro does have the support of Russia and China. The United States imposed sanctions to choke off Venezuela’s oil exports in the aftermath of Maduro’s 2018 re-election, which was widely described as fraudulent, but because customers in China, India and elsewhere continued importing, Venezuelan state-oil company […]