You dont need an ICC warrant to arrest people suspected of war crimes. States have an obligation to investigate such crimes even without the ICC involved, when they have reason to believe someone inside their jurisdiction has committed such crimes. This is not limited to their own citizens but anyone inside their jurisdiction.
Ironically the concept of universal jurisdiction also is a result of Israel abducting Adolf Eichmann in Argentinia and bringing him to Jerusalem for prosecuting his crimes as one of the key SS figures behind the Holocaust.
You dont need an ICC warrant to arrest people suspected of war crimes. States have an obligation to investigate such crimes even without the ICC involved, when they have reason to believe someone inside their jurisdiction has committed such crimes. This is not limited to their own citizens but anyone inside their jurisdiction.
Ironically the concept of universal jurisdiction also is a result of Israel abducting Adolf Eichmann in Argentinia and bringing him to Jerusalem for prosecuting his crimes as one of the key SS figures behind the Holocaust.