"U.N. Security Council resolutions prohibit North Korea from firing any ballistic missiles", Bolton told reporters in Tokyo.
North Korea should discuss the return of a US warship it seized more than 50 years ago if it has issues with the detention of a cargo vessel accused of violating United Nations sanctions, National Security Adviser John Bolton said Saturday. "I have confidence that Chairman Kim will keep his promise to me".
However, the president will visit South Korea when he returns to the Far East in June for Group of 20 meetings in Osaka, Japan, Bolton said.
As he opened a four-day visit that will focus on security, diplomacy and trade - and is filled with flourishes created to please Trump and highlight the close ties between the two leaders - the president appeared to risk ratcheting up Japanese anxiety that any nuclear agreement with North Korea could neglect their concerns. "While cooperating closely with the USA and other related countries, we are planning to tackle this appropriately by strengthening enforcement of related U.N. Security Council resolutions".
Trump is expected to discuss concerns about North Korea's nuclear and missile programs with Japanese Prime Minister Shinzo Abe during his stay in Tokyo.
Trump, who is now on an official visit to Japan, argued that he has confidence that DPRK leader Kim Jong Un would keep the promise he allegedly made to Trump. Trump ignored a shouted question Sunday about whether he agreed with Bolton's assessment.
The two leaders will also discuss rising tensions with Iran, Bolton said.
"I'm the one who tempers him", Trump said this month when reporters asked if he and his national security adviser were aligned on worldwide affairs.
Trump, now in Japan on a trip aimed at improving ties with Washington's close Asian ally, also suggested that Kim was sending him a "signal" through a North Korean state media commentary on Joe Biden - in which the former vice president was labelled an "imbecile" and a "fool of low IQ" for criticising Kim. "Perhaps that's sending me a signal?"
Update Note: President Trump deleted the original tweet, which had several typos (including spelling Joe Biden's name wrong) after this story was published, and resent a corrected version.
Bolton's remarks come on the eve of a four-day visit to Japan by the U.S. president, Donald Trump, who arrives on Saturday.
U.S. President Donald Trump attends a Japanese business leaders event in Tokyo, Japan May 25, 2019. "Maybe that's why you like me so much".