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How to study the concept of islam in international relations 
Thoroughly study the western international relations theories. 
For example, be familiar with realism, liberalism, structuralism, and so forth. You must have a good understanding of the different theories in order to be able to apply them to your research and reflection.
Study and understand the concept of islamic teachings in respect to relations between nations. After you've mastered the concepts behind the western thinking, turn to the concepts behind the eastern thinking.