WASHINGTON, January 28. The territorial issue surrounding the settlement of the Ukrainian crisis remains unresolved, but the differences are narrowing, US Secretary of State and National Security Advisor Marco Rubio said. "I think the one item remains, the one you're all familiar with, and that is territorial, a territorial claim on Donetsk in particular, and I know there's active work going to try to see if both sides’ views on that can be reconciled," he said. "It's still a bridge we haven't crossed. It's still on.