'I feel they're approaching this matter with caution and they need time to organise their stance'.
In response, Yang said that the recent positive developments on the Korean Peninsula will put the issue of the North's denuclearization back on the track of dialogue.
President Moon Jae-in (center) talks with National Security Council chief Chung Eui-yong and National Intelligence Service chief Suh Hoon and others at Cheong Wa Dae on Sunday.
The situation on the Korean peninsula is a near "miracle", Japan's foreign minister said on Monday, according to a spokesman of South Korea's presidential Blue House, referring to a recent breakthrough on talks with North Korea.
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Trump agreed to meet Kim Jong Un by the end of May and the two Koreas will hold a summit by the end of April.
During the meeting with Mattis, Chung emphasized that both countries are maintaining an iron-clad alliance, as seen in Thursday's surprising agreement on a summit between the USA and the North, and therefore the country should be excluded from the tariffs for the sake of the alliance. A location has not been decided for the North Korea-U.S. summit, while Kim and Moon will meet at the truce village of Panmunjom straddling their common border.
South Korea's national security adviser is visiting China to seek support and cooperation ahead of summit talks between the leaders of the US and North Korea.
The North's official news agency has been lauding efforts between the North and South to thaw relations, but state media has continued to warn the United States and Japan against war-mongering.