Preemptive War - Legality

Legality

Article 2, Section 4 of the U.N. Charter is generally considered to be 'jus cogens' (literally: "compelling law", in practice: "higher international law"), and prohibits all U.N. members from exercising "the threat or use of force against the territorial integrity or political independence of any state". But in the modern framework of the UN Charter, it is the phrase "armed attack occurs" in Article 51 that draws the line between legitimate and illegitimate military force. From this it is reasonable to assume that if no armed attack has yet occurred that no automatic justification for preemptive 'self-defense' has yet been made 'legal' under the UN Charter. In order to be justified as an act of self-defense, two conditions must be fulfilled which are widely regarded as necessary for its justification. The first of these is that actor must have believed that the threat is real, as opposed to (merely) perceive. The second condition is that the force used in self-defense must be proportional to the harm which the actor is threatened. When it comes to a situation where an armed attack is considered as a self-defense, it usually narrows realistic options for avoidance by nonviolent means such as negotiation, retreat, or calling upon higher authorities (such as the police or the UN).