Glyn Davies, the U.S. special representative for North Korean affairs, listens to reporters' questions during a joint press conference with South Korean nuclear envoy Lim Sung-nam at the Foreign Ministry in Seoul on Saturday, Feb. 25, 2012. (AP Photo/Lee Jin-man)

Photo by: Lee Jin-man

Glyn Davies, the U.S. special representative for North Korean affairs, listens to reporters' questions during a joint press conference with South Korean nuclear envoy Lim Sung-nam at the Foreign Ministry in Seoul on Saturday, Feb. 25, 2012. (AP Photo/Lee Jin-man)