"This means six reconnaissance planes were involved in the espionage on a daily average," the state-run Korean Central News Agency (KCNA) said.

Pyongyang has said such missions show the US aims to invade North Korea despite Washington's categorical denials. Both sides are locked in a standoff over North Korea's nuclear weapons programs.

The KCNA said "the US imperialist aggression forces" had carried out their spy missions with reconnaissance planes including the U-2, RC-135, E-3, EP-3, RC-7B and RC-12, either based in South Korea or overseas.

Six-nation negotiations aimed at ending North Korea's nuclear programs resumed in Beijing last week but ended in stalemate without setting even a date for the next round.

North Korea refused to engage in substantive discussions at the talks, citing no progress in the lifting of US sanctions imposed on Pyongyang over allegations of money laundering and counterfeiting.

Pyongyang's October 9 nuclear test added to the urgency of resolving the issue at the talks -- which group both Koreas, the United States, China, Japan and Russia.

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