They don't have to in the strictest sense in the same way as they don't have to abide by the Geneva Convention even if they were a signatory. However, in the lo

They don't have to in the strictest sense in the same way as they don't have to abide by the Geneva Convention even if they were a signatory. However, in the long term it affects their image as a country, allies trust it less, are less willing to make deals based on good faith, and so on.