"This is not helpful!" he said.
While South Korea is fast becoming a formidable force to reckon with in the global cryptospace, it's North Korean brother has been more interested in using its distributed ledger technology expertise to wreak havoc on the world.
But he insisted his relationship with Kim Jong Un remained "very good" and said he was not considering resuming joint military exercises on the Korean Peninsula that Pyongyang considers "provocative".
In contrast to improving relations between China and North Korea, Beijing has entered into a contentious trade war with Washington that may undermine cooperation efforts to enforce sanctions.
North Korea, however, has demanded the USA and South Korea first issue a peace declaration to formally end hostilities and replace the armistice that has been in effect since the end of the Korean War.
The statement said Mr Trump believed North Korea was under "tremendous pressure" from China, but Beijing was also supplying Pyongyang with "considerable aid", including fuel, fertiliser and commodities.
Secretary of State Mike Pompeo, by contrast, has asked Pyongyang to surrender 60 to 70 percent of its nuclear warheads in six to eight months, according to Vox, explaining why he was greeted with such hostility in North Korean state media. Besides, the President can instantly start the joint exercises again with South Korea, and Japan, if he so chooses. "But at this time, there is no discussion about further suspensions", Mattis said.
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"There are ongoing exercises all the time on the peninsula", Mattis said. The research unit said North Korea launched an effort to mine bitcoin between May and July a year ago, especially as a means to work around worldwide sanctions, including banking and finance sanctions.
He said holding joint exercises with the South Koreans should not be viewed as a provocation to the North Koreans, but he said he was not prepared to make a decision about the operations.
North Korea has been seeking relief from tough global sanctions and a formal conclusion to the 1950-1953 Korean War, which ended in an armistice rather than a peace treaty.
But Washington says North Korea must give up its nuclear weapons first.
Immediately after the summit Mr Trump announced there was "no longer a nuclear threat from North Korea".
"Let's see how the negotiations go", said Mattis. "I think this is what you get with non-strategic impatience", said regional security analyst Daniel Pinkston with Troy University in Seoul.
The information was provided by radio broadcast service Radio Free Asia (RFA) from the U.S., suggests that relevant names from the blockchain industry will be speaking at the event with North Korean business officials, to showcase the country's developments in tech and finance. The U.S. wants North Korea to take further steps to denuclearize before any peace declaration.
'I don't like to call it a trade war, ' Trump said Wednesday.