what/who ever that something is that is telling you that, i'd suggest a better source. it is part of the "game" that militaries the world over try to do things without their opponents knowing they were ever there. international boundaries are 12 miles of water, yet navy submarines get much much closer than that as a matter of course.

do you think the military or any 3 letter agency knows 100% where all foreign spies are within their borders?