'Tough' Ukraine talks to continue after Paris summit

Talks in Paris on the situation in Ukraine have ended without agreement.

It was the first time that EU and US government ministers had met their Russian counterpart, Sergei Lavrov, for talks on the crisis.

Meanwhile, a tense stand-off continues between pro-Russian forces and the Ukrainian military in the Crimea region, where a UN diplomat was threatened by gunmen.

BBC World Affairs Editor John Simpson reports from Sevastopol.