Geneva: The United States would be ready to resume six-party talks on North Korea if Pyongyang showed "concrete indications" it would try to implement a 2005 nuclear disarmament deal, the US No 2 diplomat said on Saturday.
US Deputy Secretary of State Jim Steinberg told a Geneva meeting of the International Institute for Strategic Studies think tank that Washington was opposed to resuming discussions without prospects of meaningful progress.
"We need to have concrete indications that North Korea is prepared, and wants, to return to the talks to seriously implement its commitments in the September 2005 joint statement," he said, adding Washington sought a "meaningful way forward" rather than just talks for the sake of talks.
The discussions, which were last held in 2008, involve the two Koreas, China, Japan, Russia and the United States.
Washington views the atomic capabilities of the North, which tested nuclear devices in 2006 and 2009, as a threat to its allies South Korea and Japan and a proliferation risk.
In the 2005 statement, North Korea promised to give up its nuclear weapons program in return for energy assistance, security guarantees and greater diplomatic recognition.
The agreement says Pyongyang could have a nuclear energy program in the future if it meets strict safeguards.
But the deal appeared to lose relevance only a year later when North Korea first tested a nuclear device.
US-North Korean relations have worsened since President Barack Obama took office, and aides have expressed deep concern about the March 26 sinking of the South Korean corvette Cheonan. Washington and other nations blame the North for the incident. Pyongyang denies the accusation.