SEOUL - South Korea has reached a landmark agreement with the United States to extend the reach of Seoul's ballistic missiles by more than twice the current limit to counter the threat from North Korea, the government said on Sunday.

The move to significantly boost the South's missile capabilities is likely to rattle the communist North which has remained at odds since the 1950-53 Korean War left the peninsula divided.

It may also stoke concern in China, Japan and Russia, parts of which would be within range of the new missiles.

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