The increasing use of Artificial Intelligence (AI)-based surveillance technologies such as facial recognition for national and public security purposes in the area of law enforcement raises serious concerns regarding the potential risks of abuse and arbitrariness it might entail, in the absence of adequate safeguards. At an international level, the impact of biometric identification systems on the protection and promotion of human rights and fundamental freedoms has been consistently emphasised by international organisations, human rights monitoring mechanisms and the civil society, particularly with regards to the risk of mass surveillance possibly resulting in the infringement upon the right of privacy and freedom of assembly. This contribution will assess the international human rights and standards applicable to the use of these technologies for national security purposes especially in the context of peaceful protest by assessing the position of the European Court of Human Rights in Glukhin v Russia (11519/20) and recent regulatory attempts.