I was expecting Ledger would require me to send back the faulty device in return for a brand new product, but they have instead written me an email stating that they will send me a new one without requiring me to return the faulty one! To be honest, I'm quite surprised!
Why are you surprised if I showed you an example in which one member of the forum also got a replacement in the same way? Personally, I was more surprised that you want to repair a device that is under warranty, but considering what @SFR10 wrote, if you are in one of the banned countries, you will have a problem with delivery.
A possible solution is to send the new device to someone who is not in the banned country (friend, relative), and then they send it to your address.