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The UN Security Council began meeting to discuss Ukraine on Thursday in the presence of the country's interim Prime Minister Arseniy Yatsenyuk, who is to address the session.
Luxembourg Foreign Minister Jean Asselborn declared the meeting open and handed the floor to UN political affairs chief Jeffrey Feltman to brief the Council on Crimea.
"The potential for intentional or unintentional escalation or miscalculation is real," said Feltman.
"We underscore that all sides must avoid unilateral actions that could further raise tensions and make de-escalation even more difficult," he added.