乌克兰总统表示俄国已派军队进入乌东
叛军已经攻占东南城市 Novoazovsk
（有可能是要打通克里米亚的道路）
http://www.bbc.com/news/world-europe-28966679
Key Points
Ukrainian President Petro Poroshenko says Russia has sent troops to eastern
Ukraine.Mr Poroshenko cancelled a trip to Turkey and called urgent meetings
of officials to consider Ukraine's response.The accusation came as
pro-Russian rebels seized control of Novoazovsk in the south-east,
threatening to take the port of Mariupol next.Alexander Zakharchenko, a
pro-Russian rebel leader in eastern Ukraine, said 3-4,000 Russian citizens
were fighting with the rebels.The Organization for Security and Co-operation
in Europe is holding urgent talks on the crisis.All times BST (GMT + 1 hour).