SEOUL, Oct. 7 (Xinhua) -- U.S. Secretary of State Mike Pompeo said here on Sunday that his talks in the Democratic People's Republic of Korea (DPRK) were productive.

The top U.S. diplomat made the remark during his meeting with South Korean President Moon Jae-in in Seoul after visiting Pyongyang earlier in the day, according to the presidential Blue House of South Korea.

Pompeo told Moon that it was very important for him to travel to Seoul right after visiting the DPRK as it indicated South Korea having a very important role in denuclearizing the Korean Peninsula.

He said his visit to the DPRK was very good and he had productive talks, noting that the two countries walked another step forward though there are lots of things left to do.

Moon told the top U.S. diplomat that he had heard of Pompeo's meeting with top DPRK leader Kim Jong Un in Pyongyang, to which the entire world was paying attention.

The South Korean president expressed his hope that Pompeo's visit to the DPRK and the upcoming second summit between U.S. President Donald Trump and the DPRK leader become an opportunity to make an irreversible, decisive progress in the denuclearization and peace process on the peninsula.

Trump and Kim were forecast to hold their second summit in the near future, after having the first-ever DPRK-U.S. summit in Singapore on June 12.

During the third summit in Pyongyang last month between Moon and Kim, the leaders of the two Koreas agreed to denuclearize the peninsula and stop hostile acts along the heavily-fortified border.