It cited an unidentified source as saying that Sergei Naryshkin, head of Russia's SVR foreign intelligence service, would attend the talks. The White House official said Burns, a former U.S. ambassador to Russia, was not conducting negotiations of any kind with Naryshkin. Ukraine was briefed in advance about Burns's trip to Turkey, the official said. Burns is not discussing a settlement of the war in Ukraine but is conveying a message on the consequences of the use of nuclear weapons by Russia, the official added. Reporting by Reuters; Additional reporting by Jonathan Spicer in Turkey; Editing by Kevin Liffey and Gareth JonesOur Standards: The Thomson Reuters Trust Principles.

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