Kim Jong-seong, the director of the unmanned aerial vehicle development program at the state-run Agency for Defense Development, speaks the outcome of a government investigation into unmanned drones recently found near the inter-Korean border areas during a news conference at the ministry in Seoul, South Korea, Thursday, May 8, 2014. Seoul's Defense Ministry announced Thursday that a joint investigation by South Korea and the U.S. concluded three drones found in the South in March and April were flown by North Korea on military surveillance missions. A ministry statement called the drone flights a military provocation and said that South Korea will strongly react to it. North Korea has denied it sent such drones, accusing South Korea of plotting another fabrication that shows its confrontational stance on the North. (AP Photo/Ahn Young-joon. Pool)