North Korea says U.S. spy planes flew about 180 missions over the country in October.
The North's official news agency said Monday that the spy flights are an example of how, privately, the United States seeks to militarily undermine Pyongyang.
The Pentagon declined to comment on the allegations.
North Korea and the United States have attended four rounds of multiparty talks to resolve a standoff over Pyongyang's nuclear weapons program.
At the last round in September, North Korea pledged to abandon those weapons programs in exchange for economic aid, security assurances and diplomatic recognition.
However, Pyongyang later demanded a light-water reactor, raising doubts about its willingness to proceed.
The next round of talks is scheduled for early November, but no date has been announced.
Some information for this story provided by AP and AFP.