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"I know we have to resolve that crisis. And part of the reason that we put Kurt Volker in the place to manage the ongoing issue with Ukraine is because the Secretary views that as something that's tremendously important," Spokesperson for the U.S. Department Heather Nauert told a briefing in Washington, DC, on September 12, 2017.

Read alsoU.S. says Tillerson not looking to escalate diplomatic tensions further with Russia – media"That has been a sore spot between the United States and Russia. We believe in Ukrainian territorial integrity. That certainly has not changed," she said.

U.S. Secretary of State Rex Tillerson appointed Ambassador Kurt Volker as U.S. Special Representative for Ukraine Negotiations on July 7, 2017.