Two years after some of Texas’ largest oil companies withdrew from Russia because of U.S. sanctions over the country’s invasion of Ukraine, they and other U.S. corporations are under threat of Russian litigation claiming they are in breach of contract.

The legal claims are largely being heard behind closed doors by arbitration panels in Europe and Russia, keeping the proceedings confidential. But U.S. Rep. Wesley Hunt, a Houston Republican leading bipartisan legislation to block the Russian effort, said Texas oil companies were among those being targeted.

“I can’t name them directly, but there are several,” he said. “American companies should never be sued by Russian assets for complying with U.S. sanctions.”

The Russian Embassy in Washington did not respond to requests for comment.