Let me explain our technical environment in terms that are a little bit more simple than the engineering terms that my team might try to get me to use.
Essentially, as Commodore Feltham says, we want to communicate with our allies. It's an essential part of working in coalition. Whether we're communicating at a top secret level, a secret level, or designated protected B level, our networks are set up in a way that they can interoperate. However, as I said earlier, gates and firewalls are left in place to segment, in the case of an incident, the different allies from those networks. Although we haven't had any major incidents of the kind you describe, the ability for us to protect our equities nationally is always built into the design and engineering of those networks.
We meet often as allies, as Five Eyes, or as NATO to discuss that interoperability and that engineering and that design function to that end.