The Trump administration is weighing whether to sanction Russia’s biggest oil producer, Rosneft, for maintaining ties with Maduro, though officials are wary that such a move could disrupt global oil markets and causing a spike in gas prices, according to Russ Dallen, head of Venezuelan investment bank Caracas Capital Markets, who closely monitors oil markets. “As Rosneft has been helping Venezuela skirt the full impact of U.S. sanctions — all the while profiting handsomely from those activities — it is only logical that the U.S. increase the cost to the Russians of continuing to assist the Maduro regime,” said Dallen.