US&nbspDefence Secretary Jim Mattis said on Sunday North Korea will receive relief only after it takes clear and irreversible steps to end its nuclear programme, adding it would be a bumpy road to a summit between US&nbspand North Korean leaders.

The comments sought to address concern the United States may be rushing to strike a breakthrough in the unprecedented summit between the two leaders after US&nbspPresident Donald Trump put the meeting back on track for June 12 in Singapore.

"We can anticipate, at best, a bumpy road to the (negotiations)," Mattis said at the start of a meeting with his South Korean and Japanese counterparts on the sidelines of Shangri-la dialogue in Singapore.

"We will continue to implement all U.N Security Council resolutions on North Korea. North Korea will receive relief only when it demonstrates verifiable and irreversible steps to denuclearisation," Mattis added.

Trump said on Friday he would hold the meeting with North Korean leader Kim Jong Un on June 12 in a dramatic turn of course in the high stakes diplomacy aimed at ending Pyongyang's nuclear weapons programme.

Eight days after cancelling the summit citing Pyongyang's "hostility", Trump announced the decision to go ahead with the meeting after hosting Kim's envoy in the White House, saying he expected "very positive result" with North Korea.

North Korea's nuclear weapons programme has been a source of major security tensions that persisted despite a series of U.N. and U.S. sanctions and it has also demonstrated advances in ballistic missile technology that experts believe now threatens the US&nbspmainland.

Japanese Defense Minister Itsunori Onodera said that while the solution to the North Korean nuclear crisis must be diplomatic, the defence cooperation among the United States and its Asian allies was key to bringing it about.

"Japan, Korea and the US&nbspcontinue to agree that pressure is needed to be applied on North Korea," Onodera told reporters after his meeting with Mattis and South Korean Defense Minister Song Young-moo on the sidelines of the Shangri-la Dialogue.

Despite a long-standing security alliance between the United States and Japan, some people in Japan worry that the United States may cut a deal to protect its cities from nuclear attack by the North, while leaving Japan vulnerable.

North Korea has conducted six nuclear tests starting in 2006 but has declared it would no longer need such tests. In May, it invited foreign journalists to witness what it said was the demolition of its nuclear test site.

The Trump administration wants the North to "denuclearise", meaning to get rid of its nuclear arsenal, in return for relief from economic sanctions.

But North Korea's leadership is believed to regard nuclear weapons as crucial to its survival and has rejected unilaterally disarming.

Trump said one thing that could come out of the summit is an agreement formally ending the 1950-53 Korean War, which was concluded only with a truce, not a peace treaty.

The comments were made by US Defence Secretary Jim Mattis who added that it would be a bumpy road to a summit between US and North Korean leaders

US&nbspDefence Secretary Jim Mattis said on Sunday North Korea will receive relief only after it takes clear and irreversible steps to end its nuclear programme, adding it would be a bumpy road to a summit between US&nbspand North Korean leaders. The comments sought to address concern the United States may be rushing to strike a breakthrough in the unprecedented summit between the two leaders after US&nbspPresident Donald Trump put the meeting back on track for June 12 in Singapore. "We can anticipate, at best, a bumpy road to the (negotiations)," Mattis said at the start of a meeting with his South Korean and Japanese counterparts on the sidelines of Shangri-la dialogue in Singapore. "We will continue to implement all U.N Security Council resolutions on North Korea. North Korea will receive relief only when it demonstrates verifiable and irreversible steps to denuclearisation," Mattis added. Trump said on Friday he would hold the meeting with North Korean leader Kim Jong Un on June 12 in a dramatic turn of course in the high stakes diplomacy aimed at ending Pyongyang's nuclear weapons programme. Eight days after cancelling the summit citing Pyongyang's "hostility", Trump announced the decision to go ahead with the meeting after hosting Kim's envoy in the White House, saying he expected "very positive result" with North Korea. North Korea's nuclear weapons programme has been a source of major security tensions that persisted despite a series of U.N. and U.S. sanctions and it has also demonstrated advances in ballistic missile technology that experts believe now threatens the US&nbspmainland. Japanese Defense Minister Itsunori Onodera said that while the solution to the North Korean nuclear crisis must be diplomatic, the defence cooperation among the United States and its Asian allies was key to bringing it about. "Japan, Korea and the US&nbspcontinue to agree that pressure is needed to be applied on North Korea," Onodera told reporters after his meeting with Mattis and South Korean Defense Minister Song Young-moo on the sidelines of the Shangri-la Dialogue. Despite a long-standing security alliance between the United States and Japan, some people in Japan worry that the United States may cut a deal to protect its cities from nuclear attack by the North, while leaving Japan vulnerable. North Korea has conducted six nuclear tests starting in 2006 but has declared it would no longer need such tests. In May, it invited foreign journalists to witness what it said was the demolition of its nuclear test site. The Trump administration wants the North to "denuclearise", meaning to get rid of its nuclear arsenal, in return for relief from economic sanctions. But North Korea's leadership is believed to regard nuclear weapons as crucial to its survival and has rejected unilaterally disarming. Trump said one thing that could come out of the summit is an agreement formally ending the 1950-53 Korean War, which was concluded only with a truce, not a peace treaty.

North Korea will get relief only after clear, irreversible steps to denuclearisation: US

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North Korea will get relief only after clear, irreversible steps to denuclearisation: US