Members of the Trilateral Contact Group, which held a videoconference on Friday, have instructed the Joint Center for Control and Coordination (JCCC) and the Special Monitoring Mission of the Organization for Security and Cooperation in Europe (OSCE SMM) to jointly investigate all ceasefire violations in the east of Ukraine, Darka Olifer, press secretary of Ukraine's representative to the Contact Group Leonid Kuchma, said.

"In response to the increased number of ceasefire violations, the Trilateral Contact Group, acting by mutual agreement, held a session in the format of a videoconference involving representatives of certain districts of the Donetsk and Luhansk regions. Following it, the JCCC and the OSCE SMM were instructed to jointly investigate all such instances and present their report at a meeting in Minsk on June 15," Olifer said on Facebook on Friday.