Putin calls Kim Jong Un competent and mature politician

"I think that Mr. Kim Jong Un has obviously won this round".

Trump said the stop-and-go nature to his strategy with North Korea is intentional and part of a broader goal.

No conversation has been publicly reported between any sitting US president and a North Korean leader in decades, if ever.

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"I have relationships with people", Trump continued. The two nations have remained in a state of war and without diplomatic relations since the Korean War ended in 1953 without a peace treaty.

The olive branch led to the first official dialogue between the two Koreas in more than two years, and an agreement for Pyongyang to send a delegation to next month's Winter Olympics in the South.

Direct talks between the USA president and Kim would be unprecedented.

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Trump claimed credit Wednesday for the inter-Korean dialogue, saying North Korea was feeling the pressure of a US -led campaign of sanctions over its nuclear weapons and missile development.

Satellite images show that North Korea has bored new tunnels near its Punggye-ri nuclear test site, indicating Pyongyang's intention to maintain its potential for future nuclear testing, a USA website specialised in North Korean affairs has said. They argue about whose nuclear button is bigger.

The images, taken on December 28, 2017 and revealed on Thursday by US-based website 38North, show that significant tunnel excavation activities were being carried out in the so-called Western Portal in Punggye-ri, in northeastern North Korea, Efe news reported.

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In another article on 38North, Alexander Vorontsov, the head of the Institute of Oriental Studies of the Russia Academy of Sciences, was quoted as saying that North Korean diplomats were extremely serious about the possibility of war between North Korea and the U.S.