What is another term that refers to the political approach of RealPolitik?

The correct term that refers to the political approach of Realpolitik is realism. Realpolitik is essentially grounded in the principles of realism, which emphasizes pragmatic and practical considerations in international relations over ideological or moralistic approaches. It seeks to prioritize national interests and power dynamics rather than ideals or ethical concerns.

Realism highlights the role of the state as the primary actor in international relations, acknowledging that the international system is anarchic, and states often act in their self-interest. This perspective aligns closely with Realpolitik, which focuses on the balance of power and seen as a ruthless and pragmatic approach to politics that is not influenced by ideals or moral considerations.

The other options - idealism, liberalism, and constructivism - represent different paradigms in international relations that either emphasize cooperation, the importance of international institutions, or the role of identities and norms, which contrast with the more opportunistic and pragmatic nature of realism and Realpolitik.