– CIMSEC – A major reversal of fortunes at sea has gone largely unnoticed. Over the past decade, the Chinese Navy sped past the Japanese maritime service across key measures of material prowess. The trendlines suggest that China will soon permanently displace Japan as the leading regional naval power in Asia. This historic power transition will have repercussions across the Indo-Pacific in the years to come. It behooves policymakers to pay attention to this overlooked but consequential shift in the naval balance between two great seafaring nations.