U.S. experts on the Korean Peninsula are scheduled to visit Pyongyang on the invitation of North Korea’s foreign ministry.

According to a diplomatic source, the experts include Joel Wit, a researcher at the U.S.-Korea Institute at Johns Hopkins School of Advanced International Studies, and Charles Ferguson, president of the Federation of American Scientists.

Sources believe that North Korea may intend to send a message to the U.S. through the visiting experts. Bilateral dialogue between North Korea and the U.S. is beginning to slow down since the second round of North Korea-U.S. talks in Geneva late in October.

In November last year, North Korea invited U.S. security experts Jack Pritchard and Siegfried Hecker, apparently to pressure the U.S. to resume dialogue by revealing its nuclear facility in Yongbyon.