Under criticism for the U.N. military's performance in the Balkans, Secretary-General Boutros Boutros-Ghali wanted the Eastern Slavonia operation to be part of the Bosnian NATO mission.

CNN: U.N. could send troops to Slavonia

Annan bristled at criticism that the U.N.

CNN: Annan defends U.N. refugee aid, says agency 'overwhelmed'

At Khan's Flex-N-Gate, some criticism of working conditions has arisen amid union efforts to organize.

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And he pointed to the United Nations' record of dealing with other humanitarian crises in an effort to balance some of the criticism that has been leveled at U.N. staff.

CNN: Annan defends U.N. refugee aid, says agency 'overwhelmed'

United Nations (CNN) -- Syria's U.N. ambassador lashed out Thursday at criticism of his daughter, who was in the news last week after ABC News' Barbara Walters expressed regret for having tried to help her.

CNN: Syria's U.N. ambassador rips criticism of his daughter