The UN Security Council will hold an extraordinary meeting on Minsk ceasefire violations in Maryinka / Photo from un.org

"Important! Ukraine is initiating a UN Security Council meeting tomorrow on yesterday's attack on Maryinka and the impudent violation by Russian-backed militants of the Minsk agreements," Permanent Representative of Ukraine to the United Nations, Ambassador Yuriy Sergeyev wrote on Twitter.

As UNIAN reported earlier, combined Russian-separatist forces early on June 3 launched a massive attack on Ukrainian troops near the town of Maryinka in Donetsk region, which later developed into an advance.

Four Ukrainian soldiers were killed near Maryinka alone on June 3, according to Ukrainian Presidential Advisor Yuriy Biryukov's update as of Thursday morning. Thirty-nine Ukrainian soldiers were wounded, he wrote on Facebook.

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