By David Brunnstrom

WASHINGTON, April 11 (Reuters) - South Korean President Moon Jae-in will meet U.S. President Donald Trump on Thursday hoping to help put denuclearization talks with North Korea back on track after a failed summit between the United States and North Korean leaders in February.

Moon arrived in Washington late on Wednesday and is due to hold talks with U.S. Secretary of State Mike Pompeo, Trump's national security adviser John Bolton and Vice President Mike Pence on Thursday morning before meeting the president at the White House shortly after midday.

Ahead of his trip, aides to Moon stressed the need to revive U.S.-North Korea talks as soon as possible after a second summit between Trump and North Korean leader Kim Jong Un collapsed in Hanoi on Feb. 28.

The White House has said Trump and Moon will discuss North Korea and bilateral issues, but U.S. officials have declined to provide details.

Moon has put his political reputation on the line in encouraging negotiations between the United States and North Korea aimed at persuading Kim to give up a nuclear weapons program that now threatens the United States.

Moon has stressed the need to offer North Korea concessions to encourage negotiations, but Washington appears to have hardened its position against a phased approach sought by Pyongyang in which gradual steps would be rewarded with relief from punishing sanctions.

The Hanoi meeting collapsed amid conflicting demands by North Korea for sanctions relief and U.S. insistence on its complete denuclearization.

On Thursday, North Korean state media said Kim had told a meeting of the ruling Workers' Party of Korea on Wednesday that he would push forward with efforts to make the economy more self sufficient "so as to deal a telling blow to the hostile forces who go with bloodshot eyes miscalculating that sanctions can bring (North Korea) to its knees."

Last month, a senior North Korean official warned that Kim might rethink a moratorium on missile launches and nuclear tests in place since 2017 unless Washington makes concessions such as easing economic sanctions.

"VIRTUOUS CYCLE"

Officials in Seoul were shocked by the breakdown of the Hanoi summit and some South Korean officials blame the influence of Bolton, a hardliner who has long advocated a tough approach to North Korea.

Moon had said he will use the meeting with Trump to discuss restarting U.S.-North Korea talks, advancing a peace process and creating a "virtuous cycle" of improving relations with Pyongyang. He said he hoped North Korea would respond positively.