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Ship JS SUZUTSUKI DD-117, an Asagiri-class destroyer in the Japan Maritime Self-Defense Force (MSDF), as it arrives at Tanjung Priok port in Jakarta, Indonesia on Tuesday, September 18, 2018.

A Japanese maritime self-defense force destroyer entered Chinese territorial waters recently in spite of warnings by Chinese vessels, Kyodo News reported Thursday.

The Suzutsuki temporarily ventured into waters off China's eastern province of Zhejiang on July 4, according to Kyodo. China's Maritime Safety Administration, Zhejiang authorities had issued a no-sail zone from July 3 to July 5 where a live-fire drill was conducted in some waters in the East China Sea.

Japan's defense ministry has started an investigation into the navy destroyer's captain after Beijing raised "serious" concerns.

The Suzutsuki, which was sent to monitor the live-fire drill, was asked by Chinese vessels to leave the area when it advanced within 22 kilometers off the coast of Zhejiang. Instead, the vessel "sped up and navigated" into the Chinese waters for about 20 minutes before leaving.

The Chinese government considers the incident to be an act of "intentional provocation," Kyodo News reported, citing sources.

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