Ukraine's interior minister Arsen Avakov has announced that three pro-Russian separatists were killed in shooting that broke out overnight in the town of Mariupol on the Sea of Azov.
"According to preliminary data, three attackers were killed, 13 wounded and 63 detained," he said in a post on Facebook.
Tensions remain high in eastern Ukraine after at least three died in a day of shooting during what was supposed to be an Easter truce.
In an exclusive interview with NBC News, the Ukrainian Prime Minister warns of the dangers of unchecked Russian expansion and aggression.
Russia, the US and the EU say that all sides have agreed to steps to "de-escalate" the crisis in Ukraine at talks in Geneva.