David Cameron and Vladimir Putin have begun bilateral talks in Paris, with the Prime Minister already threatening the Russian President with further sanctions if his government does not do more to defuse the crisis in Ukraine.
Mr Cameron is expected to urge Mr Putin to recognise the legitimacy of the new Ukrainian president, Petro Poroshenko, as well as withdrawing any support for pro-Russian separatists in eastern Ukraine.
More top news
An ancient ocean on the surface of Mars held more liquid water than the Earth's Arctic Ocean, scientists believe.
Chelsea fans are at the centre of a new racism storm after video emerged of supporters mocking the recent racist incident on a Paris Metro.
NASA's Dawn probe is preparing to make an historic rendezvous with the dwarf planet Ceres.