The senior Biden administration official, speaking on condition of anonymity, offered few details on the diplomatic push. But the official said there had been efforts to reach out to the North Korean government “through several channels starting in mid-February, including in New York.”

“To date, we have not received any response from Pyongyang,” the official said…

The Biden administration official said it appeared there had been no active dialogue between the United States and North Korea for more than a year, including at the end of Trump’s administration, “despite multiple attempts during that time by the United States to engage.”