Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Experts: Pyongyang Pushing for Further Concessions from US If It Wants to Talk Connie Kim WASHINGTON - Pyongyang is pushing for major concessions from Washington before it agrees to resume working-level talks or hold another summit with the U.S., experts say. "What the North Koreans are indicating that they want right now (are) '¦ two things essentially" as "preconditions before they schedule any talks," said Harry Kazianis, director of Korean Studies at the Center for the National Interest. "I think that is some kind of promise on sanctions relief, and I also think they want some sort of written or verbally given security guarantees." North Korea said Tuesday that the U.S. decision to postpone joint military drills with South Korea is not enough for it to return to the negotiating table. "We demand that the U.S. quit the drills or stop it once and for all," said Kim Yong Chol, chairman of North Korea's Asia-Pacific Peace Committee, in a statement carried by the official Korean Central News Agency (KCNA). "The U.S. should not dream of negotiating for denuclearization before dropping its hostile policy." U.S. Defense Secretary Mark Esper announced Sunday that the U.S. and South Korea agreed to postpone a joint air force drill scheduled for later this month. He described the move as "an act of good will" aimed at providing an atmosphere for North Korea to return to the negotiating table. .