The ceasefire violations took place near Pisky, Mayorske, and Luhanske.
None of the Ukrainian servicemen were wounded or killed in action.
On Tuesday, Ukrainian combat engineers detected 134 explosive devices all over the combat area.
Earlier, Vitold Fokin, the first Prime Minister of independent Ukraine accepted the offer to work in Minsk trilateral contact group that seeks to end Donbas conflict.
Fokin claimed that the decision to join the group was a crucial one for him.
"There are many reasons. Everyone has a smartphone these days, and networks are full of posts about me and Leonid Kravchuk being appointed to this group. Some people go for insults, mocking our age, et cetera. But I surely decided to agree, and it's an honor for me to help my Motherland in the end of my life. For me, Motherland is Ukraine and Donbas, which I truly love. It was, is and will be Ukrainian", Fokin said.
He said was his decision that he made after a conversation with Leonid Kravchuk who will be heading the Ukrainian delegation in the group.