Branches of international law closely concern international and non-international armed conflicts. So, these principles are tried to be operationalized in the Nagorno-Karabakh conflict. From the point of view of international law, the disputed region is recognized as a part of the territory of Azerbaijan, and no country has recognized the self-proclaimed Republic of Armenia there. Nagorno-Karabakh region belongs to Azerbaijan from the perspective of international law and based on the resolutions of the Security Council. This study is conducted to examine the legal aspects of the Nagorno-Karabakh crisis, seeking an answer to its legal implications. According to the results, Azerbaijan's rights to maintain its territorial integrity are undeniable and legitimate. However, the actions of the Republic of Azerbaijan, even in the context of defending its territorial integrity, should not pose a threat to the Armenian people of Karabakh. Referring to the acceptance of the principle of territorial integrity regarding the right of nations to self-determination in international law, any action against this principle is not legitimate, and the right to self-determination is accepted as long as the said principle is not violated.