North Korea's foreign minister says Pyongyang's position will not change even if the US seeks further talks, ONA reports citing BBC.
Ri Yong Ho was speaking after a summit in Vietnam between US President Donald Trump and North Korean leader Kim Jong-un ended without agreement.
Mr Trump said the US had refused demands for all sanctions to be lifted.
But at a late-night news conference, Mr Ri insisted the North had only asked for partial sanctions relief, not a complete lifting.
He said his country had made "realistic" proposals including the complete decommissioning of the Yongbyon nuclear research centre, under the watch of US observers.
"This proposal was the biggest denuclearisation measure we could take at the present stage when taking into consideration the current level of confidence between the DPRK [North Korea] and the United States," he said.
In return, Mr Ri said, the North had wanted only partial lifting of sanctions "that hamper the civilian economy and the livelihood of our people".