Military tech can do easily without highest level integration. (In fact enhancing robustness and simplifying maintenance.) The problem is keeping lower tech fabs afloat as they wouldn't get much external business. And if course sourcing base rare earth and chemical components into processes. Even machinery itself is getting problematic.

EU faces the same problem, tackling it semi-successfully with regulation, but it's size limited. Russia keeps its military to itself in working condition with few dependencies, but it is getting increasingly outdated...