REPUBLIKA.CO.ID, BEIJING -- China and Russia urged the United States on Friday not to install a new anti-missile system in South Korea, after Washington said it was in talks with Seoul in the wake of nuclear arms and missile tests by North Korea.

The United States and South Korea have begun talks on possible deployment of the Terminal High Altitude Area Defense (THAAD) system after North Korea tested its fourth nuclear bomb on Jan. 6 and conducted missile tests.

The nuclear test and missile launches are in violation of U.N. resolutions against North Korea backed by Russia and China. US and South Korean officials have expressed concern that the North could attempt a fifth nuclear test in a show of strength ahead of its Workers' Party congress, which begins on May 6.

North Korea test-fired what appeared to be two intermediate range ballistic missiles on Thursday, but both failed, the US military said.

Speaking at joint press briefing with Russian Foreign Minister Sergei Lavrov, Chinese Foreign Minister Wang Yi said the United States should respect "legitimate concerns" of China and Russia over the missile system.

"This move goes beyond the defensive needs of the relevant countries. If it is deployed it will directly impact China's and Russia's respective strategic security," Wang said.

"Not only does it threaten the resolution of the peninsula nuclear issue, it quite possibly could pour oil on the fire of an already tense situation, and even destroy strategic equilibrium on the peninsula."

North Korea's actions should not be used as an excuse to make moves that would escalate tensions, especially the US deployment of an anti-missile system, Lavrov said, according to an interpretation in Chinese.

North Korea's drive to develop a nuclear weapons capability has angered China, Pyongyang's sole major diplomatic and economic supporter. But Beijing fears THAAD and its radar have a range that would extend far beyond the Korean peninsula and into China.

Chinese President Xi Jinping said on Thursday that Beijing would not allow war and chaos to break out on the Korean peninsula.

North and South Korea remain technically at war after their 1950-53 conflict ended in a truce, rather than a treaty. The North routinely threatens to destroy South Korea and its major ally, the United States.

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