North Korea has still not taken “concrete steps” to dismantle its nuclear weapons program, Vice President Mike Pence said Wednesday, ahead of a reported meeting between North Korea’s chief nuclear negotiator and top U.S. officials.

The admission was a candid assessment from the Trump administration, seven months after the president’s summit with North Korean leader Kim Jong Un and as the White House prepares for a second meeting between the two leaders.

“While the president has started a promising dialogue with Chairman Kim, we still await concrete steps by North Korea to dismantle the nuclear weapons that threaten our people and our allies in the region,” Pence told U.S. ambassadors and chargés d’affaires assembled in Washington on Wednesday.