"China has always respected and safeguarded the freedom of navigation and overflight in the South China Sea in accordance with international law. Meanwhile, China firmly opposes certain countries' provocations in the region under the excuse of that freedom. The South China Sea is not a stage for certain countries to present their show. The Chinese military will perform its defense duty, enhance marine and air patrol to resolutely defend its national sovereignty and security, and to safeguard peace and stability in the South China Sea," he added.