Italian PM Giorgia Meloni is under investigation over the return of a Libyan warlord to Libya
Osama Elmasry Njeem was arrested in Turin on an ICC warrant for crimes against humanity
He was released and returned to Libya on an Italian government plane
The ICC expressed dismay at Italy's failure to hand over Njeem
Meloni claims the arrest didn't follow proper procedures requiring justice ministry notification
She defended the decision as protecting national security
Rome prosecutor Francesco Lo Voi is investigating potential charges of embezzlement
Human rights groups and opposition parties condemned the release
The case adds to tensions between Meloni's government and the judiciary
Former PM Renzi accused Meloni of playing victim with the investigation
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