

You report it stolen to the police. You report it stolen to your home insurance (if you have one). Then you get a new phone and move on with your life.
People talk about theft protection settings. They’re good to have. But they’re most likely not gonna get you your phone back.
It says each member will assist the attacked party/parties, as it deems necessary.
My interpretation of the article is that assistance is mandatory. What type of assistance is up to the member to decide
https://www.nato.int/cps/fr/natohq/topics_110496.htm?selectedLocale=en