does an ambassador isolate himself from his home government?

No. An ambassador does not totally isolate himself from his home government. He stays in communication with the home government, and information is constantly fed back and forth, because he remains an employee of that government. Ongoing contact is maintained.

Les explains that when our government sends an ambassador to a foreign country, he does not just totally isolate himself. He stays in communication with the home government; they constantly feed information back and forth because he is an employee of the government. This illustrates that believers, as ambassadors for Christ, are not saved to sit or merely escape hellfire but are saved to serve and be useful in God's vineyard in whatever capacity He gives.

2 Corinthians 6:1

We then, as workers together with him, beseech you also that ye receive not the grace of God in vain.

How does an ambassador to a foreign country relate to his home government?

An ambassador does not totally isolate himself from the home government; he stays in communication with it. Information constantly flows back and forth because he is an employee of that government, representing it in a foreign country and remaining accountable to it.