Peering into North Korea from Observation Post Ouellette before the meeting with Kim, Trump was briefed on the North's extensive artillery across the border that threatens the 35 million residents of Seoul, just over two dozen miles away. "All accessible by what they have in the mountains," Trump said.

from Times of India https://timesofindia.indiatimes.com/world/rest-of-world/donald-trump-arrives-at-dmz-for-meeting-with-north-koreas-kim/articleshow/70008941.cms