North Korea warned today that the US mainland is within range of its missiles, and said Washington's recent agreement to let Seoul possess missiles capable of hitting all of the North shows the allies are plotting to invade the country.
Seoul announced on Sunday that it had reached a deal with Washington which would allow it to nearly triple the range of its missiles to better cope with North Korean missile and nuclear threats.
Today, North Korea called the deal a "product of another conspiracy of the master and the stooge" to "ignite a war" against the North.
In a statement carried by the official Korean Central News Agency, a spokesman at the powerful National Defence Commission said the North would bolster its military preparedness.
"We do not hide... the strategic rocket forces are keeping within the scope of strike not only the bases of the puppet forces and the US imperialist aggression forces' bases in the inviolable land of Korea but also Japan, Guam and the US mainland," he said.
South Korea's Defence Ministry said today that it had no official comment on the North's statement, but Seoul and Washington have repeatedly said they have no intention of attacking North Korea.
North Korean long-range rockets are believed to have a range of up to about 4,160 miles (6,700km), putting parts of Alaska within reach, according to South Korea's Defence Ministry.
But the North's patchy record in test launches raises doubts about whether it is truly capable of an attack.
Pyongyang shocked Japan in 1998 when it sent a rocket over Japan's main island and into the Pacific. That also alarmed Washington because about 50,000 US troops are deployed in Japan and their bases could be within the North's range. Tokyo and Washington have since intensified their ballistic missile defences.
But the North's most recent rocket launch, in April, ended in humiliating failure shortly after lift-off.
North Korea said it was trying to launch a satellite with that launch, but the US and other countries said it was actually a test of long-range missile technology.
The failure suggests that Pyongyang has yet to master the technology it needs to control multi-stage rockets - a key capability if it is to threaten the United States with intercontinental ballistic missiles.
And although North Korea is believed to have a small nuclear arsenal, experts do not believe it has mastered the miniaturisation technology required to mount a nuclear weapon on a long-range rocket.
It is unusual for the North to say its missiles are capable of striking the US, but North Korea has regularly issued harsh rhetoric against Seoul and Washington.
Koh Yu-hwan, a North Korean studies professor based in Seoul, said the North had no choice but to respond to South Korea's extended missile range but it is unlikely to launch a provocation, as it is waiting for the results of US and South Korean presidential elections.
Under the new deal with the US, South Korea will be able to possess ballistic missiles with a range of up to 500 miles (800km). South Korea will continue to limit the payload to 1,100lb (500kg) for ballistic missiles with a 500-mile (800km) range, but it will be able to use heavier payloads for missiles with shorter ranges.
A previous 2001 accord with Washington had barred South Korea from deploying ballistic missiles with a range of more than 186 miles (300m) and a payload of more than 1,100lb (500kg) because of concerns about a regional arms race.
The Korean Peninsula remains officially at war because the 1950-53 Korean War ended with an armistice, not a peace treaty. The US stations about 28,500 troops in South Korea as deterrence against possible aggression from North Korea.
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