The G7 group of industrial nations calls on Russia to stop moves to "annex" Crimea, as Ukraine warns of a Russian military build-up at the border.
Malaysia says the last message from a Malaysia Airlines plane suggests everything was normal on board before it vanished over the South China Sea.
England coach Ashley Giles insists sacking Kevin Pietersen was correct despite the T20 series defeat in West Indies.
How did a tweet by a notorious Twitter troll end up linked to an account run by Rwandan President Paul Kagame? BBC Trending investigates.
Could the answer to future electricity demand be right under our noses? Jonathan Kalan looks at the new research behind urine-generated power.
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