UN Charter Art 2(4) not to use Force
Exception: Self Defence, Integrity
SC can use force but when the conflict could result in Threat to Peace Read Art 37, 38, 39, 41 , 42
Resolution no 660 Iraq – Kuwait War

* SELF DEFENCE 51
Collective defence like NATO
Nicargua Case
Use but must have written request from the state u support
Criteria : ICJ rules in various cases:
1) Necessity
2) Proptionality ( Famous Cases )