The statement cited US officials who are "going against President Trump" and his intent to advance relations between the two nations, saying that the president has expressed "gratitude to our goodwill measures" implemented as part of the agreement.
A foreign ministry spokesman said in a statement on state-run KCNA that North Korea was still willing to institute the broad agreement reached at the June 12 summit meeting in Singapore between US President Donald Trump and North Korean leader Kim Jong-un.
Earlier this month, U.S. Secretary of State Mike Pompeo warned Russia, China and other countries against any violation of worldwide sanctions on North Korea that could reduce pressure on the North to abandon its nuclear weapons.
The unidentified spokesperson also warned that there is no guarantee that the hard-won atmosphere of stability on the Korean Peninsula will continue.
"I can tell you we continue to have conversations virtually every day, every other day or so with the North Koreans", Heather Nauert, U.S. State Department spokeswoman, said Thursday "When I say 'conversations, ' that can be by phone, that can be my message, that can be by email".
North Korea's foreign ministry said on Thursday it had stopped testing missiles and conducting nuclear tests "followed by dismantling the nuclear test ground", and yet the United States still had insisted on "denuclearisation first".
Bolton, who spoke Tuesday, said Trump, in a letter to Kim, proposed sending Pompeo back to North Korea, and that Trump was ready to meet with Kim any time.
The statement accused U.S. diplomats of "baseless allegations" against North Korea.
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Spot Brent crude oil futures were at $73.42 per barrel at 0653 GMT on Monday, up 21 cents, or 0.3 percent, from their last close. Also, the oil markets have been squeezed by the escalating trade dispute between the United States of America and China .
The delegation, including 84 young footballers, will travel by bus to Pyongyang for their 10-day visit, marking the first overland trip by South Korean civilians to the North's capital in almost seven years.
In this photo released by official website of the office of the Iranian Presidency, President Hassan Rouhani addresses the nation in a televised speech in Tehran, Aug. 6, 2018.
The United States was "attempting to invent a pretext for increased sanctions against the DPRK".
In the most recent sign of growing frustration between Washington and Pyongyang, North Korea criticised senior American officials for insisting that North Korea give up its nuclear weapons first before easing sanctions.
"It's just North Korea that has not taken the steps we feel are necessary to denuclearize", Bolton said.
They said it had also not agreed to definitions of the key terms of any agreement, or to any inspection of its nuclear test site, which it claims to have decommissioned, but which USA intelligence officials have said may still be operable.
"They made public the North Korea Sanctions and Enforcement Actions Advisory; and additional sanctions".
But Washington has urged the worldwide community to maintain maximum sanctions pressure, even suggesting tougher economic measures, in a bid to compel Pyongyang to give up its nuclear weapons.