China warned the US and Taiwan's other arms suppliers that any help given to Taipei to defend itself against a mainland missile threat would undermine trust and regional peace and stability, The Standard of Hong Kong reported. It quoted a new white paper, "China's Endeavors for Arms Control Disarmament and Non-Proliferation," issued as President Hu Jintao prepares to visit the US next week."China opposes the attempt by any country to provide help or protection to the Taiwan region of China in the field of missile defense by any means," the paper said.