Oh that is all very stressful. I am wondering if there is some clause that can be written that neither of you can legally move the children x miles from the other person's house?
Also, I hate to say this but if the kids have passports you probably want to see what can be done about that given that you are worried about flight risk.
Given that she is hinting at "concerns" it's best to be ready to prove your own concerns, factually.
Crossing my fingers that your lawyer can assist in these matters.
Me 41, H 47, M 15 yrs, S11, S13 BD 1: 11/4/14 we work on it; really I pretzel myself BD 2: 3/31/15 H goes down to "dorm room" 8/15: H back to MBR 10/15: H back in dorm room 1/18: H files, now divorced