奥巴马将与欧洲领导人商讨乌克兰危机US President Barack Obama has arrived in Estonia for talks on Russia and the Ukraine crisis with Baltic leaders
美国总统奥巴马抵达爱沙尼亚与波罗的海各国领导人商讨乌克兰危机
He is due to hold talks in the capital Tallinn with the presidents of Estonia, Latvia and Lithuania
Correspondents say the three states, which joined Nato in 2004, are worried about Russia's intervention1 in Ukraine
Later in the week Mr Obama will attend a Nato summit that is expected to back plans for a rapid-response force that could be dispatched within 48 hours
Nato recently announced plans to set up the force to protect Eastern European members against possible Russian aggression
Russia reacted by saying it would alter its military doctrine3 to reflect "Nato infrastructure getting closer to Russian borders"
Meanwhile Russ