South Korean Special representative Kim Sook told his Russian counterpart Alexi Borodavkin that it was of key importance that all sides fulfilled their commitments, RIA Novosti reported.
Under a February 2007 deal between the six parties -- Russia, South and North Korea, the United States, China and Japan -- the North pledged to dismantle its plutonium-producing Yongbyon reactor.
Last week the U.N. nuclear watchdog, the International Atomic Energy Agency, said the North had resumed work to deconstruct the reactor after a pause of several months, RIA Novostl reported.
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