Abstract:
A countries ability to pursue justice for all depends on how well-functioning and broadly 
applicable its criminal justice system is. Most of the national laws for international crimes 
follows the fundamental principles and instruments of internationally recognized and applied 
criminal laws for which no significant differences can be seen between national and 
international tribunal regarding the trial of those crimes. The present applied universal 
principles of international crimes are not completely successful to stop the ongoing crimes of 
genocide, crimes against humanity and war crimes all over the world. The global peace and 
security, brotherhood and sovereignty of state are under threat by the current geopolitical 
situation. The overall trend of contemporary criminal justice system of the world served as a 
driving force to search for a better universal judicial system that can ensure global justice and 
end the culture of impunity along with deterring them from happening again in future. This study 
conducts a thorough examination of the procedures and difficulties of national and international 
tribunals and how criminal justice systems are now functioning throughout the world on a 
purpose of guaranteeing the equitable administration of criminal justice on a global scale. It 
also explores various gaps between national and international tribunals that they face while 
prosecuting international criminals and also pointing out the differences and injustices that 
impede the achievement of universal criminal justice. It investigates how administrative norms, 
judicial structures, and demographic factors contribute to the persistence of systemic prejudices 
considering both the contribution and loopholes of global authority like ICC, EU, and UN. 
Introduction of new principles on the trial of international crimes, application of the principle of 
complimentarily along with better cooperation of other countries, following obligatory 
principles of international legal instruments are crucial to reduce the rate of international 
crimes happening worldwide. This study found that adaptation of international principles and 
transferable strategies like parenspatriae jurisdiction can diverse the contexts to foster a more 
equitable and accessible criminal justice system. This thesishas concluded that how 
harmonization between national and international tribunals through application of new 
principles could have helped to develop the existing jurisprudence of international criminal laws 
as well as it provides ways to overcome the existing challenges faced by international Criminal 
Court.