"As long as the USA denies even the basic decorum for its dialogue partner and clings to the outdated acting script which the previous administrations have all tried and failed, one can not expect any progress in the implementation of the joint statement including the denuclearisation", North Korea's foreign ministry said on Thursday.
Mr Trump and North Korean leader Kim Jong-un agreed at the June meeting to work towards denuclearisation.
At Trump and Kim's historic summit, the two signed a document stating that Pyongyang would work toward "complete denuclearization of the Korean Peninsula".
The plans by the Korean leaders to meet come as Washington and Pyongyang try to follow through on nuclear disarmament vows made at a U.S.
Still, North Korea said it remains steadfast in its commitment to building trust and implementing in good faith the joint statement step by step.
Relations between North Korea and the U.S. remain tense, despite reassurance from the U.S. State Department that the two countries are in contact with each other.
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"As long as the U.S. denies even the basic decorum for its dialogue partner and clings to the outdated acting script which the previous administrations have all tried and failed, one can not expect any progress in the implementation of the DPRK-U.S. joint statement including the denuclearization", it said. It also claims that "high-level officials within the US administration are making baseline allegations against [North Korea] and making desperate attempts at intensifying the global sanctions and pressure".
The foreign ministry said that despite their efforts to work with the USA - by stopping their missile launches and nuclear tests - America continues to insist on "denuclearization first", and continues to encourage global sanctions against the North.
Trump's national security adviser, John Bolton, also said this week that North Korea has not taken the steps necessary to denuclearise.
The rival Koreas may try to seek a breakthrough amid what experts see as little progress on nuclear disarmaments between Pyongyang and Washington despite the Singapore summit in June and U.S. Secretary of State Mike Pompeo's several visits to North Korea.
North Korean Foreign Minister Ri traveled this week to Iran, where President Hassan Rouhani told him the United States can not be trusted after the Trump administration reneged on a 2015 deal to lift sanctions in return for curbs on Iran's own nuclear program.
Earlier this month, August 3, the USA mission to the UN submitted proposals to the UN Security Council suggesting new sanctions against North Korea.