20 questions: What's behind Ukraine's political crisis?

By Saeed Ahmed. Greg Botelho and Marie-Louise Gumuchian, CNN

Updated 2126 GMT (0526 HKT) February 20, 2014

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Ukrainian demonstrators gather in Kiev's Maidan, or Independence Square, on February 21, 2014, a day after the bloodiest day of revolution protests. <a href="http://www.cnn.com/2015/02/20/europe/ukraine-conflict/index.html">Nearly 50 activists were killed and hundreds more injured in clashes </a>in the square on February 20, 2014. The street protests soon led to the ouster of pro-Russian President Viktor Yanukovych and triggered a chain of events that included Russia's annexation of Ukraine's Crimean Peninsula and fighting in Eastern Ukraine with pro-Russian separatist forces.
Photos: Ukraine's 2014 revolution
Ukrainian demonstrators gather in Kiev's Maidan, or Independence Square, on February 21, 2014, a day after the bloodiest day of revolution protests. Nearly 50 activists were killed and hundreds more injured in clashes in the square on February 20, 2014. The street protests soon led to the ouster of pro-Russian President Viktor Yanukovych and triggered a chain of events that included Russia's annexation of Ukraine's Crimean Peninsula and fighting in Eastern Ukraine with pro-Russian separatist forces.
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A protester aims a gun in the direction of suspected sniper fire in Kiev on Thursday, February 20. Thousands of demonstrators had packed Independence Square since November when President Viktor Yanukovych reversed a decision on a trade deal with the European Union and instead turned toward Russia.
Photos: Ukraine's 2014 revolution
A protester aims a gun in the direction of suspected sniper fire in Kiev on Thursday, February 20. Thousands of demonstrators had packed Independence Square since November when President Viktor Yanukovych reversed a decision on a trade deal with the European Union and instead turned toward Russia.
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Police use water cannons against protesters in Kiev on February 20.
Photos: Ukraine's 2014 revolution
Police use water cannons against protesters in Kiev on February 20.
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An injured protester is carried away from Independence Square on a stretcher February 20.
Photos: Ukraine's 2014 revolution
An injured protester is carried away from Independence Square on a stretcher February 20.
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Captured police officers are led away by protesters in Kiev on February 20.
Photos: Ukraine's 2014 revolution
Captured police officers are led away by protesters in Kiev on February 20.
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Photos: Ukraine's 2014 revolution
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A woman on February 20 mourns over protesters who were killed during clashes.
Photos: Ukraine's 2014 revolution
A woman on February 20 mourns over protesters who were killed during clashes.
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Protesters rebuild barricades in Independence Square on February 20.
Photos: Ukraine's 2014 revolution
Protesters rebuild barricades in Independence Square on February 20.
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Riot police face protesters in Kiev on February 20.