Alliances should have a big amount of capabilities and strong individual states to deter successfully. NATO needs to decide who their adversary is, what actions to deter and what countermeasures to deter them. They should also increase their conventional forces and willingness to use nuclear weapons as a response to aggression. With this background in previous research the problem of this thesis is how does an alliance deterring strategy look like and how is it tailored to fit the adversary, threat and countermeasures. The aim for this thesis is to explain how the deterring strategy of NATO looks like and how it has changed since after the cold war till today. The results show that the deterring strategy has changed focus. From the focus on territorial, broad and denial deterrence in the strategic concept from 1999. To the focus on territorial, extended, broad and denial deterrence in the NATO summit meeting in Warsaw 2016.