"The cloud failure model most architects carry is well understood and battle-tested: Auto-scaling handles instance failures, multi-AZ deployments absorb datacenter-level events, and the region sits at the top of the hierarchy as the ultimate blast-radius boundary."
"Regions are designed to be independent, with separate power grids, network infrastructure, and physical facilities. But that assumption rests on a premise that is quietly breaking down, that a cloud region fails only for technical reasons."
"A region does not fail gracefully when a government shuts down internet connectivity at the border. It does not recover on a predictable timeline when sanctions force a cloud provider to halt services in an entire country."
Cloud regions are not merely technical constructs; they are affected by geopolitical events that can disrupt entire areas. Multi-AZ deployments are insufficient for systems vulnerable to sovereign disruptions, making multi-region strategies essential. Geopolitical events can be likened to distributed systems failures, with sanctions acting as forced dependency removals and internet shutdowns resembling network partitions. Architects must proactively create region evacuation playbooks and establish geopolitical recovery time objectives before disruptions occur. Chaos engineering should also simulate sovereign fault domain losses to test resilience assumptions effectively.
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