The UN representative in Ukraine Robert Serry was "seriously threatened" in Crimea, UN Deputy Secretary General Jan Eliasson said, adding that the "action should be seriously condemned."
"He was not kidnapped but he was seriously threatened," Eliasson told reporters in New York by telephone from Kiev.
A group of unidentified men, some of them armed, surrounded Serry and said he should leave Crimea, Eliasson claimed.
The diplomat agreed to abandon his mission to the region after sheltering in a local coffee shop with ITV News' Europe Editor James Mates.
The UN envoy's team believed the visible presence of our camera crew was probably the best protection they could have had from the militia.
ITV News were the only TV journalists with a UN envoy as he was forced to seek refuge in a Crimea cafe after being confronted by armed men.