Six people, including men from Ireland, Israel and Romania, were charged Tuesday with illegally obtaining classified defense documents.
Court papers allege the men worked with three Nigerian Defense Ministry officials to obtain information "related to a protected place." The information was to be passed on to the defense attach at the Russian Embassy in Nigeria, according to the court papers. Calls to the embassy Tuesday afternoon went unanswered.
The three foreigners and three Nigerians were brought to court in the Nigerian capital, Abuja, under tight security. Each pleaded innocent.
Judge Binta Murtala-Nyarko set the next hearing for November 21 before returning the suspects to prison.
The six face up to 14 years in jail if convicted.
Prosecutors said the alleged offenses were committed with a Russian and another Irish man now at large.