noun which may take the genitive case particle 'no'
cross-national; between nations; international
Used as a no-adjective to describe relations, comparisons, or activities between countries. Often appears in formal or academic contexts.
国家間の協力が不可欠だ。
Cooperation between nations is essential.
国家間の経済格差は依然として大きい。
The economic disparity between nations remains large.
Compound of 国家 (nation) + 間 (between).