A Second Cold War,[1][2] Cold War II,[3][4] or the New Cold War[5][6][7] has been used to describe heightened geopolitical tensions in the 21st century between usually, on one side, the United States and, on the other, either China or Russia—the successor state of the Soviet Union, which led the Eastern Bloc during the original Cold War.
The terms are sometimes used to describe tensions in multilateral relations. Some commentators have used them as a comparison to the original Cold War, while others have discouraged their use to refer to any ongoing tensions.