Exactly a year since nuclear-armed North Korea last tested a missile — its most powerful to date — news has emerged that leader Kim Jong Un is open to inspections at his country's main nuclear complex.

Citing a senior diplomatic source, South Korea's Yonhap news agency reported Tuesday that Kim is willing to let inspectors visit the Nyongbyon nuclear site. Kim had told South Korean President Moon Jae-in during their September summit that he would be willing to shutter the complex if the U.S. took "corresponding" measures.

"I understand that Chairman Kim told (South Korean) President Moon (Jae-in) during their summit in September that if the U.S. took corresponding steps he would not only be willing to shut down the Nyongbyon nuclear facilities but also allow verification," Yonhap quoted the source as saying.