North Korea has accused the United States of stepping up aerial espionage activities over its territory during high-level inter-Korean talks in Pyongyang this month, media controlled by the Stalinist state reported. The Korean Central News Agency (KCNA) said Saturday that US spy planes, including U-2s, had flown an average of more than five missions a day over North Korean airspace during April, totaling 160 sorties for the month. Full Story