In the late 1990s a new theory was developed, which Gideon Rose identified as "Neoclassical Realism". Neoclassical Realism has a dichotomous nature shared between (a) domestic politics and human nature (connecting it with Classical Realism); and (b) the international system and the distribution of power (connecting it with Structural Realism, or Neorealism).
For the theory to be tested and evaluated and for its intrinsic weaknesses and blind spots to be revealed, I have chosen in my doctoral thesis to apply it on a number of case studies, among which the USA and the UK foreign policy during the war in Kosovo in 1999.