China says the South China Sea, its islands and potential mineral wealth belong to it, and has increasingly developed civilian and military outposts there and used its coast guard to confront the ships of other nations that also claim parts of the sea.
Yin said a cruise of up to two months was necessary to conduct proper sea trials, and would include the launching of fighters under difficult weather conditions.
Chinese navy ships on their way to the South China Sea have increasingly transited through the Miyako Strait in Japan's Okinawa island chain. While the strait is an international waterway, Japan's military pays close attention to the Chinese navy's activities in the area.
The Liaoning was bought from Ukraine more than a decade ago and extensively refurbished before entering service last year. At 57,000 tons, the ship is a little over half the size of the U.S. Navy's Nimitz class carriers.
China has described the carrier as an experimental platform but hasn't said whether it will play an active service role. The lengthy refurbishment was seen as a learning exercise for China's own future carriers, now believed to be under construction near Shanghai.