Ukraine's military says the withdrawal of 100-millimeter guns "is the first step" in a process that will be monitored by the Organization for Security and Cooperation.
The foreign ministers of the four signatories to the Minsk cease-fire agreement met in Paris to discuss the fighting in Ukraine. Kiev worries that the separatists' next target will be Mariupol.
In a claim that's meeting with skepticism in Kiev, Russian-backed separatists say they've started to withdraw heavy weapons in eastern Ukraine, as required by a recent cease-fire.
Noting deadly attacks by Russian-backed separatists who have renewed a push near the southern port city of Mariupol, Ukraine says it can't withdraw heavy weapons from the front lines.
The explosion, at the demonstration marking the one-year anniversary of the ouster of President Viktor Yanukovych, occurred in the eastern city of Kharkiv.
President Viktor Poroshenko, speaking on the one-year anniversary of a bloody day of protests leading up to his predecessor's ouster, accuses the Kremlin of organizing snipers who killed dozens.
Battles rage nearly a week after a cease-fire deal. Meanwhile, a British parliamentary committee accuses the EU of a "catastrophic misreading" of Russia's designs on Ukraine.
Russian author Mikhail Bulgakov's classic, The Master and Margarita, ridiculed Soviet leaders and bureaucracy. It wasn't published until 27 years after his death, but it still resonates with Russians.
Ukraine says that in the past 24 hours alone, 14 of its soldiers have died and 172 were injured. The leaders of France, Germany, Ukraine and Russia are trying to salvage a cease-fire.
British Typhoon warplanes were scrambled after Russian military aircraft skirted England. The incident comes after the U.K. criticized Russia for its actions in Ukraine.