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U.S. National Security Adviser Jake Sullivan in recent months had discussions with top aides to Russian dictator Vladimir Putin, including Yuri Ushakov, Putin's foreign-policy adviser and Russian Security Council secretary Nikolai Patrushev, the WSJ reports quoting U.S. and allied officials. The talks, which were not disclosed publicly, aimed at reducing the risk of a broader war and warning the Kremlin against using nuclear or other weapons of mass destruction.