@cbsnews: Ukraine's top diplomat in the U.S. Denys Sienik says he hopes the localized ceasefire brokered by first lady Melania Trump between Russia and Ukraine "will be carried out by the Russian side, because there is no question about us." "We want ceasefire, and that is why we are ready for a trilateral meeting with the Russian Federation, with the American team, and look forward to such meeting next month as announced," he says. "I hope that it will happen. We need it."