The Ukraine crisis in 30 photos
Tensions remain on a knife edge in the Crimea after Russian troops took control of the peninsula and Russian President Vladimir Putin declared he had the right to invade Ukraine.
High-level diplomatic efforts to resolve the crisis in Ukraine have made little apparent headway with Russia's foreign minister refusing to recognise his Ukrainian counterpart.
It has been the biggest standoff with the West since the Cold War ended, with the US threatening to isolate Russia economically.
Here we look at how the Ukraine crisis has unfolded through 30 photos.