AWS STS Now Bridges Partitions Without Long-Term Credentials
AWS Security Token Service now lets your workloads swap IAM identities across partitions (like commercial AWS and GovCloud) using short-lived tokens instead of risky long-term access keys. This cross-partition federation is live everywhere—all commercial regions, GovCloud, China, and the EU Sovereign Cloud—at no extra cost, making multi-partition setups way more secure.
source: [aws/whats-new]