China maintains only one formal mutual defense treaty
While Beijing exerts massive global influence, it is legally bound to go to war for only one foreign nation if it is attacked.
China and North Korea share a 1,400 kilometer border and a legal bond that has endured for over six decades. While China serves as the primary economic partner for the isolated nation, their relationship is anchored by a formal mutual defense treaty. This agreement remains the only pact of its kind that Beijing maintains with any other state.