Russia's Federal Security Service detains 25 Ukrainians it accuses of planning terrorist attacks around last month's Crimean referendum.

The European Union begins the roll-out of its multi-billion-euro series of Earth-observation satellites called Sentinels.

Veteran US late-night TV host David Letterman is to retire in 2015, broadcaster CBS has announced.

The US Senate Intelligence Committee recommends the publication of part of its report into the "brutal" CIA interrogation of terror suspects.

The White House criticises Samsung for promoting a "selfie" photo taken by Boston Red Sox player David Ortiz with President Barack Obama.

A killer is put to death in the US state of Texas after a court rejects defence lawyers' demands for the source of its lethal injection drug.

Two sailors die and 11 more are missing as a cargo ship carrying a North Korean crew sinks off South Korea.

The underwater search for missing Malaysia Airlines flight MH370 begins - with pinger locators on two ships in a section of the Indian Ocean.