Some predict changes could include making the tours smaller, keeping groups behind glass or back away from the border where troops from both sides stand almost face to face.
The U.S. military was scrambling on Wednesday to determine the soldier's fate, as well as his motive.
South Korea's arms sales jumped to more than $17 billion in 2022 from $7.25 billion the year before, according to its defense ministry.
Pyongyang has built hundreds of kilometers of new or upgraded border fences, walls and guard posts along its borders with China and Russia, commercial satellite imagery shows.
"There is an increasing need for Korea and Japan to cooperate in this time of a polycrisis," Yoon said.
NATO Secretary-General Jens Stoltenberg is in Seoul, the first stop on a trip that will include Japan and is aimed at strengthening ties with U.S. allies.
A hacking group has targeted those with knowledge of issues regarding the country, apparently in a bid to gain intelligence, information and insight.
Not doing do so would lead to an influx of military assets to the region, Yoon said, including higher defense spending in Japan and more deployments of American warplanes and ships.
Some analysts argue that despite North Korea’s deeply patriarchal society, gender may not disqualify a daughter or another woman from taking the reins.
Pyongyang's record-busting number of missile launches have highlighted that the country is likely supported in part by overseas networks that provide funding and material, analysts say.
