North Korea announced Saturday that it had suspended nuclear and longer-range missile tests and shut down its main nuclear test site as the sanctions-hit country seeks to shift its focus to shoring up its moribund economy, state media said, less than a week before a key inter-Korean summit.

Leader Kim Jong Un called the completion of its nuclear weapons program a "great victory," and said that "no nuclear test and intermediate-range and inter-continental ballistic rocket test-fire are necessary for the DPRK now."

"The mission of the northern nuclear test ground has thus come to an end," he added at a gathering of the Central Committee of the ruling Workers' Party, according to the official Korean Central News Agency.