The study of security relates to measures and policies undertaken by states and international organisations to provide public safety. Security involves strategic decision making and policy implementation aimed to provide tangible outcomes on a daily basis. To achieve this, security actors may rely on diplomacy, international agreements and military capabilities. In normative terms “security” refers to moral and rational factors that make actors in the international system identify and define dangers and threats. The concept of security can be understood as a study of threats that distinguishes between threats which can be tolerated and others which require immediate defense actions.