Ukraine orders full military mobilisation over Russia moves
Ukraine has ordered a full military mobilisation in response to Russia's build-up of its forces in Crimea.
Acting President Olexander Turchynov has ordered the closure of airspace to all non-civilian aircraft.
US President Barack Obama has called Russian troop deployments a "violation of Ukrainian sovereignty".
Ukraine has said it will seek the help of US and UK leaders in guaranteeing its security. Nato has called emergency talks to be held at 1200 GMT.
Several other measures were announced by Andriy Parubiy, chair of the national security and defence council of Ukraine:
The armed forces would be put on "full combat readiness".
Reserves to be mobilised and trained
Emergency headquarters to be set up
Increased security at key sites, including nuclear plants.
The BBC has seen what appear to be Russian troops digging trenches on the Crimean border.
Heavily armed groups continue to occupy key sites on the peninsula, including airports and communications hubs, although there has been no actual violence.
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Interesting
hope China and most otehr countries remain neutral
most Crimeans are ethnic Russian and support Russia. Russia always had fleets based in the Black Sea. According to some Ukrainian Minister, Russia handed out free Russian passports to many Crimeans, too, so Russia is just protecting its citizens.
