Ukrainian President Viktor Yanukovych's decision last November to withdraw from an association deal with the EU resulted in street protests that eventually led to him fleeing to Russia.
Pro-Russian forces have since taken over the southern Crimea region of Ukraine. The crisis has taken East-West relations lurching back towards the Cold War with the United States and the EU replying with sanctions on Russia.
The Organization for Security and Co-operation in Europe (OSCE), currently chaired by Swiss President Didier Burkhalter, has attempted to de-escalate tensions.
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