The concept of grey-zone conflicts or warfare is distinct from the concept of hybrid warfare,[11] although the two are intimately linked as in the modern era states most often apply unconventional tools and hybrid techniques in the grey-zone.[12] However many of the unconventional tools used by states in the grey-zone such as propaganda campaigns, economic pressure and the use of non-state entities do not cross over the threshold into formalized state-level aggression.[10]