I have a friend in an interesting situation. He suspects that he will be unsafe if he returns to his home country, and he is currently living in the UK with a valid visa. In order to renew his passport, he must go to his country's embassy in the UK, and I am curious what the security situation with this is.
I understand that if you are in an untrusted foreign country, your own embassy is able (to some extent) to protect you from the local police (if you have committed a crime in the host country you can of course be "extracted" from the protection of your embassy).
What I am asking is, if you enter your own country's embassy, are the host country's police able to help you, for example to protect you against being deported by embassy staff? For example, if you wish to stay in your current host country, can your passport-issuing country deport you back home if you step into their "jurisdiction" inside their embassy?