International Desk: North Korea has lashed out at the US for continuing to call for the enforcement of sanctions.
The foreign ministry said there would be no moves towards denuclearisation if the US followed an "outdated script".
It accused US negotiators of going against the intentions of President Donald Trump and the spirit of the summit in Singapore.
Mr Trump and North Korean leader Kim Jong-un agreed in June to work towards denuclearising the Korean peninsula.
But the details of that process remain vague - North Korea did not commit to unilaterally give up its nuclear weapons and the UN says its nuclear programme is continuing.
The US has insisted that diplomatic and economic pressure must be maintained on the North until it stops all nuclear development.
North Korea's foreign ministry said on Thursday: "As long as the US denies even the basic decorum for its dialogue partner and clings to the outdated acting script which the previous administrations have all tried and failed, one cannot expect any progress in the implementation of the joint statement including the denuclearisation."
It is the latest criticism from North Korea since the historic meeting in Singapore, which had appeared to be the start of a thawing in the relationship between the old enemies.
Earlier this week, North Korea's foreign minister called US actions "alarming". And last month, North Korea accused the US of using "gangster-like" tactics in the negotiations.
risingbd/Aug 10, 2018/Mukul