- Amid tensions from South Korea, U.S. President Donald Trump announces that he is "allowing Japan and South Korea to buy a substantially increased amount of highly sophisticated military equipment from the United States." Context: 2017 North Korea crisis, Donald Trump, South Korea, South Korea-United States relations
- South Korean President Moon Jae-in and U.S. President Donald Trump agree to revise the South Korea Ballistic Missile Range Guidelines which caps South Korea's missile development. Context: 2017 North Korea crisis, Donald Trump, South Korea, South Korea-United States relations
- A South Korean adviser says it is "impossible" for South Korea to purchase the THAAD missile complex since control of its operation would remain with the United States. The remarks come after United States president Donald Trump suggested that South Korea pay for the $1 billion system. Context: Donald Trump, South Korea, South Korea-United States relations
- U.S. President Donald Trump visits Japan amidst the 2017 North Korea crisis. Context: 2017 North Korea crisis, Donald Trump
- A South Korean lawmaker claims that in 2016, North Korean hackers stole classified military documents detailing joint operations between the South Korean and United States military forces in the event of war with North Korea. Context: 2017 North Korea crisis, South Korea