Blasts of incoming and outgoing artillery echoed all night across Donetsk a once bustling industrial city but now the crucible of one of Europe's worst humanitarian and diplomatic crises since the Cold War.
Rebel city administration member Ivan Prikhodko said two civilians were killed and eight seriously wounded when a shell hit a bus stop on the war-wrecked northwestern edge of town.
"The bus stop itself and a store nearby have been levelled," Prikhodko told AFP by telephone.
Russia's defence ministry called the charges "absolute nonsense" and once again denied supporting the rebel cause.
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The Kremlin accused Ukrainian President Petro Poroshenko of rejecting a troop withdrawal proposal submitted last week by Russia's Vladimir Putin.
Ukraine meanwhile set in motion a previously-approved fourth wave of military call-ups since the start of hostilities in mid-April.
The 50,000 new volunteers and reservists will be mostly deployed in the war zone in stages stretching over three months. The infusion of additional forces reflects Ukraine's increasingly frantic attempt to defend against what it views as Russian "aggression".
President Vladimir Putin's spokesman said the resumption of what Kiev now says is full-scale war means no peace summit is likely any time soon.
A meeting between Putin and Poroshenko that would also include the leaders of France and Germany "can only happen if it is prepared in a way that guarantees its success," Kremlin spokesman Dmitry Peskov told Russia's TASS state news agency.