Much interaction at the system level is governed by them, and they outlaw some traditional institutions and practices of international relations, such as the use of war (except in self-defence).
Sebagian besar interaksi pada tingkat sistem diatur oleh mereka, dan mereka menyingkirkan sejumlah institusi dan praktik Hubungan Internasional tradisional, seperti pelaksanaan perang (kecuali demi mempertahankan diri).