War – its preparation, rehearsal, prosecution, and remediation – is increasingly the preoccupation of 21st century states and peoples. Attention in 2022 focussed on the savage fighting in the Black Sea and Ukraine, but preparations, plans and rehearsals on a hitherto unprecedented scale for conflict were underway around the world, notably in the form of US-led and organized exercises in the Baltic, the East and South China Seas, the Mediterranean and the Pacific, with an expansive NATO and US-led regional engagement involving new roles for Japan, India, Australia and others in the Western Pacific.