A letter envoy Richard Grenell sent to several businesses "reminds that any company operating in the Russian energy export pipeline sector... is in danger under CAATSA of US sanctions," an embassy spokesman told AFP.
The Countering America's Adversaries Through Sanctions Act (CAATSA) adopted in 2017 targets Iran, Russia and North Korea. Close Donald Trump ally Grenell's letter "is not meant to be a threat, but a clear message of US policy," the spokesman said.
"The only thing that could be considered blackmail in this situation would be the Kremlin having leverage over future gas supplies," he said.
Combined with the planned TurkStream pipeline across the Black Sea, Nord Stream 2 would do away with the need to transport natural gas to Europe via Ukraine -- robbing the country of a factor shielding it from Russian aggression, Grenell said.
The two countries are in conflict over the eastern part of Ukraine and the annexation of the Crimean peninsula by Russia in 2014. "Firms supporting the construction of the two pipelines are actively undermining the security of Ukraine and Europe," Grenell wrote.
Washington's fears about the pipeline are shared by a number of eastern European Union countries including Poland, and the European Parliament last month passed a resolution condemning the construction.
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