"The Chinese navy has the capability to cut the first island chain into several pieces," said Du Wenlong, a senior researcher at the PLA's Academy of Military Science.
"Now the chain is fragmented," Du told state-run China Daily.
The 'first island chain' refers to the first major archipelagos off the East Asian continental mainland, including the Japanese archipelago, Ryukyu Islands, China's Taiwan and the northern Philippines.
The US and allied countries installed a strong military presence and advanced weapons at bases along the line,it said.
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Five Chinese warships finished the historic trip four days ago, during which the Chinese navy for the first time entered the Pacific through the Soya Strait, known in Russia as La Perouse Strait, between the Russian island of Sakhalin and the Japanese island of Hokkaido, the report said.
It was the first time the Chinese navy conducted high-sea training right after a major drill, with no rest, it said.
On July 25, the ships crossed the Miyako Strait between Japan's Miyako and Okinawa islands on their return voyage to Qingdao, headquarters of the North China Sea Fleet.
The move marks the first trip by the Chinese navy circumnavigating the Japanese archipelago.
Japan sent frigates and aircraft to monitor the Chinese fleet at a short distance, the report said.
"It has crossed all the strongest parts on the chain," he said, adding that the repeated passages show that the PLA navy is now capable of sending and supporting its warships to navigate and fight in channels far from the continent.
Li Li, a researcher at the PLA's National Defence University, said going through the Soya Strait means much more than giving China new access to the Pacific.