Nations in the World cannot live in isolation. I.e they cannot live full independent of others. This implies that in one way or the other, they will be needing the assistance of some other countries in their Socio, Economic and Political Sphere
However, State cant isolate itself from the rest of the world, then the understanding of this fact prompt nations to design action , decision, principle, instrument, objective and national interest which guide the relation with other state in tge World.
Foreign policy is a necessary activities that is engaged in by countries in the international system. This is because of the near fact that number no man is an island at that effect, the state can be island to itself.
The essence of this statement is that, it is not possible for any state to be isolated from the action and inaction of other states be its favourable or adverse
Each state within the international system has to fashion a policy that appear to posses single will and purpose towards external environment in a way that national interest is best served and protected
Therefore, foreign policy and national interest are inseparable concept in international relation.
The main essence of foreign policy is to achieve national interest. This implies that national interest of is unachievable without the instrumentality of foreign policy.
Nations seek to attain different goals and objectives in the process of governing their sovereign entities . while some of the goals can be attained by states on their own, others can only be attained with the co-operation or active support of other similar entities beyond boarder.
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