By Kari Lindberg (Bloomberg) — Two U.S. carriers conducted a military exercise in the South China Sea, signaling that U.S. President Joseph Biden and his administration are taking a strong stance to oppose China’s territorial claims in the disputed waters. The dual carrier operations by the Theodore Roosevelt Carrier Strike Group and the Nimitz Carrier Strike Group on Tuesday conducted a “multitude of exercises aimed at increasing interoperability between assets as well as command and control capabilities,” the U.S. Navy said in a statement. The exercises were used to demonstrate the Navy’s ability to operate in challenging environments, it said.