Putin sworn in for fourth term as Russian president

Vladimir Putin was sworn in as Russia's president for a fourth term on Monday, extending his almost two-decade rule by another six years at a time of high tension with his Western rivals.The 65-year-old, in power since 1999, is on course to become the longest-serving Russian leader since Joseph Stalin after his victory in March elections.Putin won nearly 77 percent of the vote in polls in which his most vocal opponent, Alexei Navalny, was banned from running.