Ukraine Crisis: Ukraine In Bid To Retake Buildings
They say they hope buildings in Lugansk and Donetsk will be freed shortly as well.
On Monday, pro-Russia demonstrators seized government buildings in the three cities.
Russia recently annexed the peninsula of Crimea following a referendum.
Moscow has assembled thousands of troops along its border with eastern Ukraine.
Although it insists it has no intention of invading Ukraine, it says it reserves the right to defend ethnic Russians in the country.