Three ships entered the waters surrounding the uninhabited chain, the Japan Coast Guard said in a statement. The isles are controlled by Japan as the Senkakus but claimed by China as the Diaoyus.
The incursion came at around 2:00 pm (0500 GMT) and the ships were cruising in a south-southwesterly direction, according to the statement.
Their arrival came two days after James Mattis, US President Donald Trump's new defence secretary, said in Tokyo that the island chain was subject to a longstanding Washington-Tokyo defence treaty.
China was quick to accuse the United States of stirring up trouble in Asia with the comments by Mattis.
Its foreign ministry spokesman said Washington should "stop making wrong remarks... And avoid making the issue more complicated and bringing instability" to the region.
China and Japan have repeatedly clashed diplomatically over ownership of the islands, and both sides regularly send ships to nearby waters to assert their claims.
He balanced that message, however, with a call for disputes to be settled through arbitration and diplomacy and ruling out any immediate military response.
China, Taiwan and a handful of Southeast Asian states have claims in the area.
Besides Japan, Mattis also visited South Korea last week as he sought to assure the key allies of continued US commitment to their security.
Trump rattled them last year while he was a candidate, with calls for them to pay more for defence support.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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