North Korea has said it is still willing to talk "at any time in any form" after US President Donald Trump abruptly cancelled his meeting with Kim Jong-un.
Vice-foreign minister Kim Kye-gwan said Mr Trump's decision was "extremely regrettable".
President Trump blamed the North's "open hostility" for the cancellation.
The summit would have been the first time a sitting US president had met a North Korean leader.
The details of the meeting in Singapore on 12 June were unclear. But talks would have focused on ways of denuclearising the Korean peninsula and reducing tensions.
Just hours before Mr Trump's announcement, North Korea said it carried out its promise to dismantle tunnels at its only nuclear test site.
Mr Trump announced the cancellation in the form of a letter personally addressed to Mr Kim.
Mr Trump said he had been "very much looking forward" to meeting Mr Kim.
"Sadly, based on the tremendous anger and open hostility displayed in your most recent statement, I feel it is inappropriate, at this time, to have the long-planned meeting," Mr Trump said in a letter to Mr Kim.
"You talk about your nuclear capabilities, but ours are so massive and powerful that I pray to God they will never have to be used," he added.
But he called the meeting a "missed opportunity", saying "someday, I look very much forward to meeting you".
In a later statement at the White House, Mr Trump said the step was a "tremendous setback for North Korea and the world", adding the US military was "ready if necessary" to respond to any "reckless" act from North Korea.