Thanks, I've just remarked the zero!
The answer is no, of course, but it was only a question of testing.
Now I have run a short script:
Code:
script
console_command diplomatic_stance romans_julii greek_cities war
   
end_script
and this is the result
It works!

So I can think in refining this system to stablish "security perimeters" or "security zones", where any movement will be seen as an agression.
Thanks again!