Aerospace warning and control is completely binational through NORAD. Maritime warning is binational through NORAD. Maritime control is bilateral through CJOC and USNORTHCOM, with NORAD providing some of the information.
In terms of cyber, right now the responsibility for Canada rests with Public Safety Canada, and for the U.S. with the Department of Homeland Security. There is still a long road to travel before we go in a binational manner in the cyber domain, but we do as much as we can to collaborate bilaterally through NORAD, CJOC, and USNORTHCOM.