(Reuters) - South Korea said on Sunday it has extended its air defense zone to partially overlap with a similar zone declared by
China two weeks ago that has sharply raised regional tensions.
Beijing's declaration of an air defense identification zone in an area that includes islands at the heart of a territorial dispute with
Japan has triggered protests from the United States and its close allies Japan and South Korea.
Announcing the expansion of its own zone to include two territorial islands to the south and a submerged rock also claimed by China, South Korea's Defence Ministry said the move would not infringe on neighboring countries' sovereignty.
"We believe this will not significantly impact our relationships with China and with Japan as we try to work for peace and cooperation in Northeast Asia," defence ministry head of policy Jang Hyuk told a briefing.
"We have explained our position to related countries and overall they are in agreement that this move complies with international regulations and is not an excessive measure," he said, adding the ministry's top priority was to work with neighboring countries to prevent military confrontation.
South Korea had objected to China's November 23 move as unacceptable because its new zone includes a maritime rock named Ieodo, which Seoul controls, with a research station platform built atop it. China also claims the submerged rock.
But South Korea's reaction to Beijing has been more measured than the sharp rebukes delivered from Tokyo and Washington, reflecting a sensitivity towards Seoul's largest trading partner.
REGIONAL TENSIONS
South Korea's air defence zone was originally established by the U.S. Air Force in 1951 during the Korean War. The extension of the zone will not apply any restrictions to the operation of commercial flights, the defence ministry said separately in a statement. The move will take effect on December 15, it said.
It will also result in an overlap with Japan's air defence zone, Jang said.
There was no immediate reaction from China, although Beijing's response to news last week that South Korea was reviewing its options on the air defence zone was relatively low key.
Chinese Foreign Ministry spokesman Hong Lei said on Friday that any move by South Korea must "accord with international law and norms", but added: "China is willing to maintain communications with South Korea on the basis of equality and mutual respect."
The decision by China that kicked off the latest spat was the subject of a tense disagreement as U.S. Vice-President Joe Biden visited China last week, stressing Washington's objections to the move that he said caused "significant apprehension" in the region.
Ties between China and Japan, always fraught due to regional rivalry and lingering bitterness from World War Two, have been strained for months by the dispute over the islands in the East China Sea, called the Diaoyu by China and the Senkaku by Japan.
Washington takes no position on the sovereignty of the islands, but recognizes Tokyo's administrative control and says a U.S.-Japan security pact applies to them.
Beijing says its zone is in accordance with international law and Washington and others should respect it.
Under the Chinese zone's rules, all aircraft have to report flight plans to Chinese authorities, maintain radio contact and reply promptly to identification inquiries.
U.S., Japanese and South Korean military aircraft have breached the zone without informing Beijing since it was announced. South Korean and Japanese commercial planes have also been advised by their governments not to follow the rules.
(Reporting by Jack Kim and Jane Chung; Editing by Alex Richardson)
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