From the speech of the President of the Republic of Azerbaijan Heydar Aliyev at the opening ceremony of the Fourth International Congress of Pediatric Societies held in Baku – Azerbaijan State Academic Theatre of Opera and Ballet, September 21, 1997
…The military aggression of Armenia against Azerbaijan has begun since 1988. As a result of the aggression 20 per cent of the territory of the Republic of Azerbaijan has been occupied by the Armenian armed forces.