ASSIMI Goita, the Malian colonel who has overthrown two presidents in the past nine months, said he would oversee a transition toward democratic elections as he was sworn in as interim president. Goita, a 38-year-old special forces commander, had already been declared president by the constitutional court last month after ousting Bah Ndaw, but was formally sworn in on Monday during a ceremony in the capital Bamako. He is under pressure from regional and international powers to ensure elections go ahead next February as scheduled, who worry the political upheaval could jeopardise gains made against Islamist insurgents based in the…