North Korea is accusing the South of deliberately sabotaging reconciliation discussions planned for this week.
It follows a disagreement over the rank of the officials to head the delegations that were to meet in Seoul.
The aborted talks had been intended to reopen the joint Kaesong industrialised zone which was closed earlier this year amid threats of war from Pyongyang.
After the collapse of the talks North Korea has stopped answering its recently re-established hot line to the South. Analysts say the country often alternates from threats to negotiations in a bid to extract diplomatic recognition from the United States.