North Korea has condemned the United States for being "hell-bent on hostile acts", despite a recent agreement between the two countries to resume nuclear talks.
Pyongyang's delegation to the United Nations said on Wednesday that the United States was "obsessed with sanctions".
This comes days after the countries' two leaders held a historic meeting in the heavily fortified demilitarised zone which divides the two Koreas.
Donald Trump became the first sitting US president to set foot in the North.
And after talks that lasted for almost an hour, both the leaders agreed to set up teams to resume stalled negotiations on denuclearisation.
But the latest North Korean statement marks a shift in tone and a return to the angry exchanges that have marred relations between the countries in recent times.
North Korea also accused Washington of attempting to "undermine the peaceful atmosphere" on the Korean peninsula.