"Some people said that my rhetoric is very strong, but look what's happened with very weak rhetoric over the last 25 years, look where we are right now", he added.
"I think it's expected we'll meet with Putin, yeah".
North Korea's recent actions, including several missiles that overflew Japan and Pyongyang's sixth and largest nuclear test, have raised the stakes in the most critical worldwide challenge of Trump's presidency.
"Together with our allies, America's warriors are prepared to defend our nation using the full range of our unmatched capabilities... every once in a while, in the past, they underestimated us". Trump has criticized the deal as a source of the USA trade deficit with South Korea, an argument officials there dismiss.
US President Donald Trump touched down in Japan Sunday, kicking off the first leg of a high-stakes Asia tour set to be dominated by soaring tensions with nuclear-armed North Korea. "We want Putin's help on North Korea, and we'll be meeting with a lot of different leaders", Trump told reporters on Air Force One.
North Korea has conducted about 20 ballistic missile tests this year in defiance of U.N. resolutions, including two intercontinental ballistic missile tests that experts said suggest that a missile could reach parts of the United States. Earlier in the day, North Korea warned Donald Trump to refrain from any "irresponsible remarks", the France press reported.
In a conversation with journalists, the USA leader described the North Korean crisis as "a big problem" for his country and the entire world.
'We want to get it solved.
Without "distinguished leadership", North Korea would have "fallen a victim to the invasion by the barbarous USA imperialists".
The claim was made in September by a retired Air Force general who said the figure was estimated based on a conventional war scenario and did not include potential use of nuclear weapons. North Korea "will be a big topic" for Japan, South Korea and China, Trump said about the three countries that he will visit first during his Asian tour. With North Korea's defeat - but at what cost?,' Givens said. A hint at a military option or crude insults directed at Kim - like the term "Little Rocket Man" he previously used to deride the young North Korean dictator - is certain to enrage North Korea, which could react with weapons tests and threats of war.
Meanwhile, South Korea has also begun tightening its measures against the Pyongyang by implementing sanctions against 18 North Koreans.
'There is only one way that this war ends.
China's fuel exports to North Korea fell in August, along with iron ore imports from the isolated nation, as trade slowed after the latest UN sanctions, but coal shipments resumed after a five-month hiatus.