What does the red line in Google mean?

No, this is not a highway, but a disputed border between the two countries in the eyes of the United States. I looked carefully, and the red stripe in America has a strong double color. Pro-American, even if the border is disputed, he will not mark it in red. For example, Georgia on the red border is a place where the United States wants to mess up and intervene, such as China, resource countries in Africa, the Balkans in the Middle East and Eastern Europe.