Shell Chief Executive Officer Wael Sawan discusses the company's performance as its fourth-quarter profit slumped, undershooting expectations. "There is indeed a bit of oversupply at the moment," he tells Bloomberg Television. Sawan also comments on Shell's buybacks as the oil company maintained its quarterly share buyback of $3.5 billion. "We are preferentially allocating capital to buybacks because we still see a very attractive buyback in Shell," he adds. (Source: Bloomberg)