What is Russia's endgame in Ukraine?

Pro-Russian activists hold a huge Russian national flag in front of the regional administration building in Donetsk, Ukraine, Sunday, April 6, 2014. In Donetsk a large group of people surged into the provincial government building and smashed windows. A gathering of several hundred, many of them waving Russian flags, then listened to speeches delivered from a balcony emblazoned with a banner reading a "Donetsk Republic". (AP Photo/Andrey Basevich)

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    What is Russia's endgame in Ukraine?

Russia wants a "complete sphere of influence over Kiev," says former Defense Department official Peter Brookes.