That's similar to the issued the IT administration of the german Bundestag faced when parts of their network got owned. I think not seeing it as "one network"

That's similar to the issued the IT administration of the german Bundestag faced when parts of their network got owned. I think not seeing it as "one network" but instead of seeing it as an internet in which some instances offer services for other instances helps. The "one" network is prone to fail because in such an environment you can't fit all parties under one hat. (And perimeter security is dead, anyway.)