A deadly gunfight in a town in restive east Ukraine on Sunday shattered a fragile Easter truce, with Russia declaring it was "outraged" at the return to violence in the crisis-hit former Soviet republic.

Three pro-Russian militants and one attacker were killed in a firefight at a roadblock close to the separatist-held town of Slavyansk, said a local pro-Kremlin rebel leader, Vyatcheslav Ponomarev. (AP)

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