The three Plebejus species are also notoriously difficult to tell apart but I believe this one to be Reverdin's Blue/Plebejus argyrognomon.
UPDATE - Jan2022: This has since been re-identified as the extremely variable Idas Blue/Plebejus idas, which is not a lifer, unfortunately. Reverdin's is only supposed to be at lower altitudes whereas these were taken at 1900m.
