Biegun did not directly address North Korea's recent statement, which jarred with Seoul's rosier presentation of the North Korean position and could potentially rattle a fragile trilateral diplomacy to defuse a nuclear crisis that last year had many fearing war.
While North Korea has insisted that U.S.-led international sanctions against the country should be removed before any progress in nuclear negotiations, Biegun reiterated Washington's stance that the punitive economic measures should be maintained until the North takes firmer steps toward irreversibly and verifiably relinquishing its nuclear arsenal.
Biegun said Washington was prepared to "explore a number of other things" that could build trust with North Korea and push diplomacy forward, but didn't elaborate what those were. He earlier said Washington was reviewing easing travel restrictions on North Korea to facilitate humanitarian shipments to help resolve the impasse in nuclear negotiations.
"The United States has no intention of easing our unilateral or United Nations sanctions," he said. "But we have a number of initiatives that we would like to look at as we begin the process of denuclearization of North Korea."
Biegun arrived in South Korea on Wednesday for a four-day trip to coordinate the allies' policies on North Korea, including the enforcement of sanctions. Biegun and South Korean officials also discussed the ongoing reconciliatory steps between the Koreas to reduce tensions, including a groundbreaking ceremony planned next week for a project to reconnect their roads and railways.
The latest North Korean comments could be seen as proof of what outside skeptics have long said: that Kim will never voluntarily relinquish an arsenal he sees as a stronger guarantee of survival than whatever security assurances the United States might provide. The statement suggests North Korea will eventually demand the United States withdraw or significantly reduce the 28,500 American troops stationed in South Korea, a major sticking point in any disarmament deal.
Kim and Trump met June 12 in Singapore where they agreed on a vague goal for the "complete denuclearization" of the Korean Peninsula without describing when and how it would occur. But North Korea for decades has been pushing a concept of denuclearization that bears no resemblance to the American definition, with Pyongyang vowing to pursue nuclear development until the United States removes its troops and the nuclear umbrella defending South Korea and Japan.