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On Monday, Japan's nuclear envoy, Shinsuke Sugiyama, met with South Korea's vice foreign minister in Seoul to discuss measures against the North's uranium enrichment program.
Sugiyama also expected to exchange ideas with South Korean officials regarding the resumption of the six-party talks aimed at ending North Korea's nuclear ambitions.
The six-party talks offer Pyongyang aid and diplomatic recognition in return for disabling its nuclear weapons program. They were last held two years ago.
The talks ended when the North quit in protest against U.N. sanctions for its nuclear and missile tests.
The North has since called for the six-party talks to be restarted. But Washington, Seoul and Tokyo have questioned the North's sincerity about ending its nuclear program.