US sanctions against Russia could impact the development of a trans-European gas pipeline.
The Kremlin said earlier this week that penalties could hurt investment projects with European partners, such as the Nord Stream Two pipeline from Russia to Europe.
But Russian officials said it was too early to tell how they would respond to any imposition by President Donald Trump.
The White House said on Sunday that Trump was open to signing legislation toughening sanctions on Russia after Senate and House leaders reached agreement on a bill late last week.
This brought about fears in Germany, where firms are already involved in the project carrying Russian gas across the Baltic Sea.
Kremlin spokesman Dmitry Peskov said: “We are working with our European partners on implementing a number of large-scale projects.
“It goes without saying that we and our European partners attach great importance to finishing these projects and we will work towards this.
“That is why discussions about ‘sanctions themes’ — which could potentially obstruct these projects — are a cause of concern for us.”
Peskov said the Kremlin took “an extremely negative view” of the proposed new sanctions.
He said the rhetoric surrounding them was counter-productive and damaging to US-Russia ties.
But he said Moscow was for now ready to wait and see what the final shape of the sanctions might be.