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Russian President Vladimir Putin (C) arrives at Yamaguchi Ube Airport in Ube, western Japan on December 15, 2016.
Putin arrived in Japan on December 15 for a hot spring summit aimed at reaching a deal over a group of small islands that have prevented the countries from formally ending their World War II hostilities. / AFP / POOL / Koji Sasahara        (Photo credit should read KOJI SASAHARA/AFP/Getty Images)
Russian President Vladimir Putin (C) arrives at Yamaguchi Ube Airport in Ube, western Japan on December 15, 2016.
Putin arrived in Japan on December 15 for a hot spring summit aimed at reaching a deal over a group of small islands that have prevented the countries from formally ending their World War II hostilities. / AFP / POOL / Koji Sasahara        (Photo credit should read KOJI SASAHARA/AFP/Getty Images)

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    Sources: Intel shows Putin approved hacking

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Sources: Intel shows Putin approved hacking

A US official familiar with the US intelligence assessment of the Russia election-related hacking said the understanding is that the operation was carried out with sophisticated hacking tools.

Sources: Intel shows Putin approved hacking

A US official familiar with the US intelligence assessment of the Russia election-related hacking said the understanding is that the operation was carried out with sophisticated hacking tools.