US President Donald Trump said that he thinks he will meet his North Korean counterpart Kim Jong-un in early 2019.
'At some point, ' he will, Trump said about hosting Kim in the United States, with this weekend's announcement raising the spectre of such a trip being just weeks off.
After Trump and Kim met in June in Singapore, negotiations between Washington and Pyongyang have been stuck due to bilateral differences on key problems over the scale of denuclearisation, USA sanctions, and whether to issue a war-ending declaration, among others.
Trump and Chinese President Xi Jinping have agreed to suspend any new tariffs in the trade war between the world's two largest economies following their meeting during the G20 summit.
Differences over how to denuclearize the North have kept the 2 countries from deciding the date and venue of the next summit.
They agreed on the need for "maintaining vigorous enforcement of existing sanctions to ensure North Korea understands that denuclearisation is the only path", Sanders said.
The North's leader Kim Jong Un, during a summit with the South's President Moon Jae-in in April, said the North's railway infrastructures are "embarrassingly" dilapidated, praising the South's high-speed railway system.
They have begun work to reconnect their railway systems, removed landmines and destroyed military bunkers at parts of the frontier.
A team of South Korean officials boarded to investigate how the North's rail network can be modernised and potentially linked up to the South.
Kim had been expected to visit Seoul in mid-December but the North asked for a delay citing internal affairs.
Trump and Kim met in June in a historic summit in Singapore aimed at curbing Pyongyang's nuclear and ballistic missile programs. The two leaders said Kim's visit to the South Korean capital "would provide additional momentum to their joint efforts to establish peace on the Korean peninsula", Moon's press secretary Yoon Young-chan said.