1. A country or state that conducts an official inquiry or investigation into a matter of international concern, typically in legal, diplomatic, or criminal contexts
The investigating nation submitted its findings to the international court.
A nação investigadora apresentou suas conclusões ao tribunal internacional.
2. In international law, the state responsible for conducting a formal investigation, often as part of treaty obligations or UN mandates
The investigating nation was tasked with examining the alleged violations.
A nação investigadora foi encarregada de examinar as alegadas violações.