of Serbia, North Macedonia, Montenegro and Turkey are exempt from this restriction if they are stranded abroad and are repatriated to their country of origin. Third-country nationals (not covered by one of the exemptions from the temporary restriction of entry for non-essential reasons) who seek to enter the Schengen Area will be refused entry at the border crossing point and will receive a refusal of entry form (with the reason of refusal marked as "I", i.e. a threat to public health), as well as a passport stamp cancelled by an indelible cross in black ink and the letter "I" on the right hand side. The obligation imposed by European law on national border authorities to stamp travel documents of certain travellers should not prevent the development of automated border control systems which are then made available to those who are required to have their travel documents stamped when crossing the external border of the Schengen Area. One solution is to dedicate separate lanes to third-country nationals and to have a border guard physically positioned next to the automated border gates used by these lanes who can stamp travel documents where required: this has been adopted by the Finnish Border Guard at the automated border gates in Helsinki Airport, where eligible users (who are required to receive a passport stamp) include holders of Canadian, Japanese, South Korean and United States biometric passports, and in the Port of Helsinki, where eligible users (who are required to receive a passport stamp) include Russian citizens, as well as by the Portuguese Serviço de Estrangeiros e Fronteiras at the automated border gates in Lisbon Airport where eligible users (who are required to receive a passport stamp) include holders of Angolan and Brazilian passports and holders of diplomatic/service passports. This approach has also been adopted in Italy, where eligible users of eGates include holders of Australian, Canadian, Israeli, Japanese, New Zealand, Singaporean, South Korean, United States and Vatican biometric passports. A similar but slightly different solution has been adopted by the Dutch Royal Marechaussee at the Privium iris recognition automated border gates at Amsterdam Airport Schiphol, where eligible users include registered EU/EEA/Swiss citizens, US citizens who are Global Entry members, and all nationals who are holders of diplomatic passports, as well as by the German Federal Police at the ABG Plus iris recognition automated border gates at Frankfurt Airport where eligible users include registered EU/EEA/Swiss citizens