Thae Yong-ho was quoted on Monday as saying that North Korean leader Kim Jong-un "will drag on for two to three years" without dismantling his nuclear weapons "while waiting for the USA president to be replaced".
The upcoming summit between South Korean President Moon Jae-in and North Korean leader Kim Jong-un will be a historical event all in itself and even more so as it will likely set the tone for the following U.S.
The report said the focus of the inter-Korean summit's agenda would be threefold: denuclearization of the Korean Peninsula, a peace deal, and progress in inter-Korean relations.
The communist state staged almost a dozen missile launches in less than seven months after Moon's inauguration, while also conducting its sixth and most powerful nuclear test so far in September.
North Korean leader Kim Jong-un (right) shakes hands with South delegation leader Chung Eui-yong in this photo released by North Korea's Korean Central News Agency March 6, 2018.
North Korea responded after months or years of confrontation, agreeing to take part in the PyeongChang Winter Olympic Games held earlier this year in South Korea.
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But the two countries have been seeking to warm ties ahead of Kim's meeting with Moon on April 27 and with Trump by June over the North's nuclear weapons program.
While North Korea and China are mending ties, Japanese Prime Minister Shinzo Abe headed to the United States on Tuesday to meet Trump to discuss both trade and Trump's plans for a summit with the North Korean leader.
"We must successfully hold the South-North summit so it will also lead to the success of the North-U.S. summit", President Moon said while meeting with a group of advisers on Thursday.
No peace treaty has been signed to replace the 1953 armistice that ended the Korean War, and the US and North Korea have been at loggerheads since formal hostilities ceased.
The peninsula remains bisected in a perpetual stalemate, with the USA -backed South Korean military lined up against more than a million North Korean troops.
Meanwhile, the inter-Korean summit preparatory committee said that it will open a website (www.koreasummit.kr) on Tuesday to swiftly provide people with all the news and data related to the summit. USA officials have said those talks would focus on denuclearizing the North.