Ukraine's interior ministry says the military is now in full control of the airport in the eastern city of Donetsk after a day of bloody clashes SIA reports quoting the BBC.
At least 30 pro-Russia separatists have been killed, the insurgents say. Kiev said the army suffered no casualties.
Armed separatists had tried to take over the airport early on Monday.
Ukraine's new President Petro Poroshenko then vowed to tackle "terrorists" in the east "within hours, not months".
Russian Foreign Minister Sergei Lavrov on Tuesday again called on Mr Poroshenko to stop military operations in eastern Ukraine immediately and implement a roadmap for peace negotiated in Geneva on 17 April.
Speaking at a news conference in Moscow, he said a "real war" was under way in the eastern Donetsk and Luhansk regions.
The regions declared independence after Russia annexed the Crimean peninsula in the wake of the removal of Ukraine's pro-Moscow President Viktor Yanukovych.
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