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| Ukraine calls up reservists after Russian deployment | |
| (35 minutes later) | |
| Ukraine has announced it is calling up military reservists, following Russia's decision to allow deployment of troops. | |
| Acting President Olexander Turchynov had already ordered increased security at key sites, including nuclear plants. | |
| US President Barack Obama has called the Russian decision 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 on Sunday at 1200 GMT. | |
| Announcing the mobilisation of reservists, Andriy Parubiy, chair of the national security and defence council of Ukraine, also said the armed forces would be put on to "full combat readiness". | |
| The new Ukrainian Prime Minister Arseniy Yatsenyuk has warned that military action by Moscow would be "the beginning of war and the end of relations". | |
| 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. |