Update: according to Reuters, Vladimir Putin was deeply upset to learn of the death of Vitaly Churkin, Russian news agencies cited Kremlin spokesman Dmitry Peskov as saying on Monday.
"The head of state highly valued Churkin's professionalism and diplomatic talent," Peskov said.
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Vitaly Churkin, who served as Russia's permanent representative to the United Nations since 2006, "died suddenly" in New York, the Russian Foreign Ministry announced. Churkin died one day before his 65th birthday. Russia's deputy U.N. ambassador, Vladimir Safronkov, told AP that Churkin became ill and was taken to Columbia Presbyterian Hospital, where he died Monday.