Former U.S. Defense Secretary William Perry says that although the six-party nuclear dialogue has been useful and will continue to be, it failed to resolve the issue of nuclear development in North Korea.

Speaking at the Global Korea 2009 Academic Forum in Seoul Monday, Perry praised the new U.S. government's appointment of former Ambassador to South Korea Stephen Bosworth as the U.S. special representative for North Korea.

He said, however, that "it's time to press a reset button on dealings with the North."

He called on Bosworth to closely cooperate with South Korea and Japan on the North Korea issue.

Perry asked the nuclear envoy to clearly convey to the North the incentives nuclear abandonment presents and the costs it will pay for nuclear development.

He suggested Bosworth accept the communist Pyongyang government as is.

Perry was secretary of defense under the Clinton administration and served as a U.S.-North Korea policy coordinator in 1998.