It is, depending on the extent to which some nations are prepared to go. There is at some point—how shall I put it—a barrier where the national interests meet the strategic interests of the alliance, and for reasons that have more to do with how these nations deal with their own safety or security when it comes to cyber, they may not be interested in actually being so interoperable that the nations that cannot actually protect their own systems would have visibility or would have an input into their system.
Again, it's the question of feeling absolutely sure that by opening up a bit more than you are now, you're not actually introducing a Trojan Horse in your own system. Until all nations have the certainty that this is absolutely the case, then I don't think that you're.... I guess what I'm saying is that interoperability is incremental. It will progress as the cyber-defence in allied nations progresses.