• Self-defence is a lawful reaction to the ‘armed attack’ against the territorial integrity of a state, which is based on the State-centred approach to security. • There are two types of self-defence: anticipatory and pre-emptive self-defence. • Anticipatory self-defence refers to self-defence actions where there exists an “imminent” attack. This should relate to the application of early warning mechanisms. • Pre-emptive self-defence refers, on the contrary, to non-imminent threats or more remote threats. This should relate to human security approach.