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Japanese Deputy Foreign Minister Shinsuke Sugiyama said Japan- China ties gradually improved since last year as the two sides agreed to establish air and maritime emergency contact mechanism and high-level negotiations over maritime issue.

Chang said President Xi and President Park have exchanged visits in recent years, which help improve the level of the strategic communication and the mutual trust.

The senior official also urged the authorities to rebuild a desirable political ecology in the province.

According to Sectur, each country will have the opportunity to share its experiences with the others at two scheduled plenary sessions.

Negotiators from Iran and six major countries -- the United States, Britain, France, Russia, China, and Germany -- met again about the nuclear issue on Feb. 22 in Geneva, Switzerland. China has called for political resolve from all parties.