An Australian Federal Police (AFP) staff member has pleaded guilty to stalking his former partner and illegally obtaining her new address from the police database.

Roman Eiginson, 53, pleaded guilty to two offences in the ACT Magistrates Court today.

Court documents reveal the couple split after the woman returned from a visit to relatives overseas to find he had married a Russian woman.

Eiginson repeatedly tried to contact his former partner by phone, email and on Facebook in March and April last year.

He also hung around outside her home where she lived with her new partner, and at one point accosted her as she arrived at her workplace.

Eiginson, a former Russian soldier, had joined the AFP as a staff member in the counterterrorism unit after moving to Australia.

He has been suspended from his position.

Eiginson has already spent several months in custody before bail was granted last year.

He remains on bail and will be sentenced in August.