LEAD:
According to reports in the Russian media, the White House is investigating a leak of details about Vladimir Putin and Donald Trump's first phone call. Reuters earlier reported that in his first call as president with Russian leader Vladimir Putin, Donald Trump denounced a treaty that caps US and Russian deployment of nuclear warheads as a bad deal for the United States. Julia Lyubova reports from Moscow.
IN: Reuters quoted two U.S. officials..
OUT: SOC
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