By Jack Stubbs MOSCOW (Reuters) - Russia's combative ambassador to the United Nations, Vitaly Churkin, died suddenly in New York on Monday after being taken ill at work, the Russian Foreign Ministry said. It declined to comment on reports that Churkin had been taken to a hospital shortly before his death. A U.S. government official, who was not authorized to speak publicly on the case, said that Churkin had died of an apparent heart attack.



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