A spokesman for the foreign ministry of the Democratic People's Republic of Korea (DPRK) confirmed Friday that it had reached "a series of common understandings" with the United States on the need to resume the six-party talks and the importance to implement the 2005 joint statement.

The two sides held lengthy talks on a wide range of issues including a peace treaty, normalization of bilateral ties, economic and energy cooperation and denuclearization of the Korean Peninsula, the official KCNA news agency quoted the unnamed spokesman as saying.

The "frank and sincere" talks helped the two sides "deepen mutual understanding, minimize the difference and find commons," he said.

The two sides agreed to continue to cooperate to bridge their differences, he added.

U.S. envoy on the DPRK policy Stephen Bosworth concluded a visit to Pyongyang on Thursday, seeking to persuade the DPRK to return to talks aimed at ending its nuclear weapons program.

During his stay, Bosworth met with DPRK's First Vice Foreign Minister Kang Sok Ju. It was the first bilateral talks between the United States and the DPRK since U.S. President Barack Obama took office in January.