Ministerial talks in Paris on the Ukraine crisis were "tough" but will continue, the US says, as a tense stand-off continues in Crimea.

Venezuela's President Nicolas Maduro breaks diplomatic relations with Panama over its request for the OAS to discuss the crisis in Venezuela.

The world's biggest social networking site Facebook tightens its rules on posts relating to guns.

A Central Intelligence Agency watchdog looks into reports it improperly monitored members of the US Senate intelligence committee.

US researchers reveal another baby carrying the HIV virus, which leads to Aids, may have been cured through early antiretroviral therapy.

Costa Rica presidential candidate Johnny Araya, from the governing party, says he is abandoning his campaign for April's run-off election.

EU leaders will hold an emergency summit to decide how strongly to respond to Russia's troop deployment in Ukraine's Crimea region.

Portuguese scientists identify a dinosaur that may have been the largest predator ever to roam across the European landmass.