I agree with Laurie, as well. While it might seem like a huge step, he is toying with you and with the security of his children. When my XAH started down this path, I knew that he was no longer interested in protecting me and our family. For me, it was a sign from my HP to stop taking care of someone who not only didn't protect/care for me - but who was actively hurting me and my children. To me, it seemed like we had become objects to use to prove a point.
IMO, yor husband's action is vindictive and controlling - and it serves as a good guide for the future.
The courts will remind him of his responsibility. And you will know what you actually had to do to protect your children from him.