(BBC) – Germany and the US have warned they could target a key Russian gas pipeline if the country invades Ukraine.
A US state department spokesman said the Nord Stream 2 pipeline “will not move forward” if Russia were to attack.
The controversial energy project is designed to double gas flow and runs from Russia direct to Germany under the Baltic Sea.
It circumvents Ukraine, which relies on existing pipelines for income and is under threat from Russian forces.
Tens of thousands of Russian troops have massed on Ukraine’s borders in recent weeks, prompting fears of an invasion – despite repeated Russian denials of any plan to attack.
On Wednesday the US rejected Russia’s key demand to bar Ukraine from joining the Nato military alliance, while offering Moscow a “serious diplomatic path forward”.
President Vladimir Putin is currently assessing the proposals, his spokesman said on Thursday.
Nord Stream 2 in focus
The 1,225km (760-mile) pipeline took five years to build and cost some $11bn (£8bn). But as yet it has not started operating, as regulators said in November it does not comply with German law and suspended its approval.
Speaking to broadcaster NPR, US state department spokesman Ned Price said his country would work with Germany to ensure the project did not go ahead if Russia invaded.
“I want to be very clear: if Russia invades Ukraine one way or another, Nord Stream 2 will not move forward,” he said, but added that he was “not going to get into the specifics” of how it would be stopped.
Germany’s foreign minister, Annalena Baerbock, later told the German parliament that Western allies are “working on a strong package of sanctions” covering aspects “including Nord Stream 2”, promising serious consequences for Russia if it were to attack.
It came after the German ambassador to the US Emily Haber tweeted that “nothing will be off the table, including Nord Stream 2” if Russia violated “Ukraine’s sovereignty”.