Vladimir Putin is to be inaugurated as president of Russia in a ceremony in the capital, Moscow. Mr Putin will return to the presidency after an absence of four years in which he served as prime minister. The outgoing President, Dmitry Medvedev, was widely seen as an ally of Mr Putin. He won a third term as president in controversial elections in March.
On Sunday, thousands of protesters opposed to the inauguration clashed with police in Moscow. (BBC)