The two nations have been arguing over control of uninhabited islands in the East China Sea.
China and South Korea are at odds over a part of the East China sea.
Tokyo and Beijing have been at loggerheads over a group of disputed islands in the East China Sea.
The radar incident happened near a group of islands in the East China Sea which both countries claim.
Japan is currently embroiled in a separate territorial dispute with Beijing over islands in the East China Sea.
Much more worrying for Tokyo is China's push to claim disputed East China Sea islands, our correspondent adds.
Talking about tension, lets not forget China and Japan and the East China sea Island dispute.
Onto the coastal borders: the Taiwan Straits, the Bohai Bay, the East China Sea and the South China Sea.
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China and Japan disagree over who owns islands in the East China Sea.
Beijing also offered help to its neighbor acrosss from the East China Sea.
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In addition to North Korea's missile program, he cited China's intrusions into territorial waters around contested East China Sea islands.
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On the bitter row with China over disputed islands in the East China Sea, he said US support was key.
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Mr Abe is currently facing an escalation in a separate dispute with China over islands in the East China Sea.
North Korea said the rocket would fly south, likely over open waters of the Yellow Sea and East China Sea.
Officials said the Washington is deployed in the East China Sea and the Stennis is in the South China Sea.
China Daily and Southern Metropolis Daily highlight how Fu Ying blamed Japan for escalating an East China Sea islands dispute.
On September 7, the captain collided with and may have rammed two Japanese patrol vessels in disputed waters in the East China Sea.
Chinese consumers like Japanese technology, but feel strongly about the territorial dispute that is playing out in the East China Sea.
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China has called off a scheduled round of talks with Japan over the exploitation of gasfields under the East China Sea.
Since last summer, Japan has been embroiled in a rancorous dispute with China over a group of small East China Sea islands.
Since last summer, Japan has been embroiled in a bitter dispute with China over a group of small East China Sea islands.
They have been hurt by a territorial dispute between Beijing and Japan over a group of islands in the East China Sea.
Experts in China hit out at Japanese media claims challenging Beijing's denial over a radar lock incident near disputed East China Sea islands.
"These negotiations are about the protection of maritime resources in the East China Sea, " Japan's Chief Cabinet Secretary Yoshihide Suga said on Wednesday.
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Ties between Tokyo and Beijing are currently very strained over a row about ownership of islands both claim in the East China Sea.
"China hopes that Japan take effective measures to stop stirring up tension in the East China Sea and making irresponsible remarks, " it said.
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