You don't file AR-11 for foreign addresses. The purpose of AR-11 is for USCIS and ICE to be able to track your location within the US.
If you are returning to the same old address that you had before leaving the US, you don't need to file AR-11 if your last AR-11 already had that same address. But if you're returning to a new US address, your last address on the AR-11 would be your last US address, not the foreign address.