Red/green zones or just about any partial/segregated lockdown seems likely to not work. Being in a red zone is worse than being in a green zone so people are in

Red/green zones or just about any partial/segregated lockdown seems likely to not work. Being in a red zone is worse than being in a green zone so people are incentivised to move from red zones to green zones (if they can). This is not what you want. It seems hard to restrict movement or enforce a strict quarantine in countries that are generally not planned to support restricting movement across internal boundaries.