"Today, the Department of State is updating the public guidance for CAATSA (Countering America's Adversaries Through Sanctions Act) authorities to include Nord Stream 2 and the second line of TurkStream 2," Pompeo said at a press briefing.
"This action puts investments or other activities that are related to these Russian energy export pipelines at risk of U.S. sanctions," he added.
Pompeo said that these projects are not commercial but serve as Moscow's tools to exploit European dependence on Russia's energy supplies that ultimately undermine transatlantic security.
"Companies aiding and abetting Russia's malign influence projects will not be tolerated," he noted. "Get out now or risk the consequences."
President Donald Trump has long voiced his discontentment about the Nord Stream 2 project, complaining about Germany's large payment to Russia on energy and "delinquency" on military spending.
The Nord Stream 2, stretching 1,230 km from Russia to Germany via the Baltic Sea, is scheduled to start operation in the middle of 2020.
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