"For every taken life of our servicemen, they will pay with tens and hundreds of theirs. Not a single terrorist will escape responsibility, everyone will get what they deserve," Poroshenko said Friday.
The president met Friday with security officials to discuss the militants' use of Russian-made BM-21 Grad rocket launchers against Ukrainian forces.
More than 30 Ukrainian soldiers and border guarders were reportedly killed earlier Friday by Grad missile strikes launched by rebels against a military camp near Zelenopillya, approximately 40 miles from Lunhansk.
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