The trouble starts with the names: the Sea of Japan is the East Sea to South Korea, and the East Sea of Korea to Pyongyang.
Further, the U.S. and the U.S.S.R. drew battle lines dividing Asia, across the East Sea, through Korea's 38th Parallel and the Taiwan Strait, and along Vietnam's 17th Parallel and the Mekong river.
Influenced by the writings of Fernand Braudel and Immanuel Wallerstein (historians who helped establish a tradition of global comparative history), large numbers of Japanese intellectuals are beginning to realise that a global economic system existed in the areas around the Indian Ocean, the Arabic Sea, the South China Sea, and the East China Sea long before the westernisation of the world.
While Japan has been focused on its territorial dispute with China, Thursday's scramble against Russia was a reminder that the northern part of the Sea of Japan facing Russia can be as tense as the East China Sea to the south.
Onto the coastal borders: the Taiwan Straits, the Bohai Bay, the East China Sea and the South China Sea.
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Officials said the Washington is deployed in the East China Sea and the Stennis is in the South China Sea.
The jellyfish spawn along the coasts of the East China Sea and the Yellow Sea (see map in article) and some drift towards Japan.
The Unha-3 rocket blasted off at around 10 AM local time from a space center in the village of Tongchang-ri on the west coast of the Korean Peninsula, flew over the East China Sea, the Japanese prefecture of Okinawa, and then past the Philippines.
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Cue the dispatch of three Japanese destroyers equipped with missile interceptors to the East China Sea near Okinawa, and the positioning of ground-to-air PAC-3 missile-busters on land nearby.
For the first time since the eighteen-seventies, Japan has a serious Asian rival, and politicians on both sides of the East China Sea are still picking at the wounds of the last great war.
It has suspended talks on the joint exploration of gasfields in the East China Sea as well as over increased flights between the two countries.
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"Who stipulated that only Japan is allowed to engage in provocation, while we are not allowed to defend ourselves?... In the East China Sea, we should stipulate a safe distance range from China for the Japanese!"
However, the dispute centred around a group of islands in the East China Sea, which flared up late last year, has hurt relations between the two countries and seen Japan's exports to China decline.
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.
Talking about tension, lets not forget China and Japan and the East China sea Island dispute.
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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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.
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.
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