Foreign Ministry spokesman Lu Kang reiterated China's sovereignty over the South China Sea islands on Thursday, asking countries "outside the region" to help maintain peace in the South China Sea.

When requested to respond to comments Steve Bannon, chief strategist of the White House, made more than 10 months ago that "there's no doubt" that China and the US will fight a war in the South China Sea in five to 10 years, Lu said China has "indisputable sovereignty" over the South China Sea islands and their adjacent waters.

"China firmly safeguards its territorial sovereignty and maritime interests in the South China Sea," the spokesman said.

"Meanwhile, China is committed to maintaining peace and stability of the South China Sea together with countries in the region," he said.

"We hope countries outside the region will respect the common interests and common wishes of the regional countries, and make sure the region remains peaceful, stable and secure, which benefits all parties," Lu added.