Secretary of State Mike Pompeo said Thursday that the world is at “the dawn of a new day” in confronting the threat posed by North Korea’s weapons programs but that sanctions against the country must continue for now.

In a speech before the United Nations Security Council, Mr. Pompeo said President Trump’s summit meeting in Singapore with North Korea’s leader, Kim Jong-un, had laid the groundwork for the complete denuclearization of the Korean Peninsula.

But he told the council that until that process is complete, the world must abide by the economic sanctions still in place against the government in Pyongyang.

“We must not forget what’s brought us this far: the historic international pressure campaign that this council has made possible through the sanctions that it imposed,” Mr. Pompeo said.