After shaking hands with Kim over the line that marks where their two countries and their allies fought each other to a standstill in the 1950-53 Korean War, Trump walked for several steps into North Korean territory, before another handshake. The two men then walked into Seoul's territory together -- pausing on the line for photographers -- where they were joined by South Korean President Moon Jae-in.

from Times of India https://timesofindia.indiatimes.com/world/rest-of-world/donald-trump-steps-into-north-korea-in-historic-first/articleshow/70009322.cms