BEIJING, Feb. 21 (Xinhua) -- China said on Tuesday that it hoped the United States would do what is good to the peace and stability in the South China Sea as a U.S. aircraft carrier strike group began patrolling the region.

"China always respects the freedom of navigation and overflight of all countries in the South China Sea in accordance with international law, but we oppose those who threaten and harm the sovereignty and security of coastal countries under the pretext of freedom of navigation and overflight," said Foreign Ministry spokesperson Geng Shuang at the daily press briefing.

Geng made the remarks while responding to reports that the U.S. aircraft carrier strike group, including Nimitz-class aircraft carrier USS Carl Vinson, began routine operations in the South China Sea on Feb. 19.

The situation in the South China Sea is becoming more stable under the joint efforts of both China and the Association of Southeast Asian Nations (ASEAN), Geng said.

"We hope relevant countries, especially those outside the region, can respect the efforts made by China and the ASEAN, maintain the good situation, and do more things that are helpful for peace and stability in the South China Sea," Geng said.