A plan to send U.S. Marines to provide security for a U.S. facility in Taiwan has drawn a warning from China, which is sensitive to any challenge to its claim of sovereignty over the island.

“The ‘One China’ principle is the political foundation for China-U.S. relations,” Chinese Foreign Ministry spokesman Lu Hang told reporters Friday. “The U.S. should honor its commitment to the ‘One China’ principle and refrain from any official ties or military exchanges with Taiwan.”