Ukrainian President Petro Poroshenko convened his top generals Tuesday to discuss the latest failed peace talks with pro-Russian militias, aimed at stemming clashes that saw seven troops killed in another wave of attacks.

The European-mediated talks fell apart after more than six hours due to what one separatist said was Kiev's refusal to move back its forces from four strategic sites.

Council chief Oleksandr Turchynov -- a hawkish political veteran who served as acting head of state following the March 2014 ouster of Ukraine's Russian-backed president -- reported the death of three more soldiers in overnight attacks.

Kiev said four of its troops had been killed on Monday and the fighters reported one loss in the past two days.

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