Ukraine sits wedged on the Black Sea between the European Union and Russia. This is a very tough spot for any country as it must weigh closer economic ties with Europe versus generous energy deals from Russia, which might isolate Ukraine from western support. Unfortunately for the president, he suddenly chose closer ties to Russia in November when it looked very likely he would side with the EU. The public erupted in anger. The country is now divided between protesters in Kiev and President Yanukovych's psupport in the east and the police forces. Headquarters have been set on fire. People have been set on fire. Hopefully, a full scale civil war will not break out.
Rachel Maddow has a very good summary of the latest developments:
What looks like a revolution is taking place in the country's capital that could cut off Russia's wider influence. If successful, the revolutionaries could get extensive revisions to the constitution and a new regime. Also they look particularly effective with fire Good for them.