On September 25, 2017, North Korea announced they might shoot down any US warplanes they can, even if it wasn’t in their airspace. They consider the US to have declared war on the country with his many comments. One of the main ones they point to is that “North Korean leadership won’t be around much longer.” This also came after a group of US military planes flew farther over the demilitarized zone border between the North and South Korea than any missions in this century.
The United States opposes the North Korean nuclear program which is on track to put the US in it’s range. South Korea has pledged to back the US in any verbal or physical conflict. China “wants things to calm down.”