Venezuela’s populist leader Nicolas Maduro won a new six-year term on Sunday, but his main rivals disavowed the election alleging massive irregularities in a process critics decried as a farce propping up a dictatorship. Victory for the 55-year-old former bus driver, who replaced Hugo Chavez after his death from cancer in 2013, may trigger a new round of western sanctions against the populist government as it grapples with a ruinous economic crisis.