(Bloomberg View) -- Since 2014, President Barack Obama's administration has punished three of the four states considered the top cyber threats to U.S. computer networks: China, Iran and North Korea. The curious exception is Russia, the country experts and Hillary Clinton's campaign say was behind the hack of the Democratic National Committee.

While senior U.S. officials have called out Russia in broad terms for its increasingly aggressive behavior in U.S. cyberspace, the U.S. has only once tied Russia to a specific attack. That was in 2015 when Secretary of Defense Ash Carter accused Moscow of probing a Pentagon system.

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