IT HAS become a cliché to note that the war in Ukraine is a drone war. But two recent studies shed light on what that means in practice. In mid-February the Royal United Services Institute (RUSI), a think-tank in London, published the latest in a series of papers taking stock of tactical developments in Ukraine over the preceding year. On March 6th the Centre for Strategic and International Studies (CSIS) released another paper looking at Ukraine’s capacity and plans for war specifically involving artificial-intelligence (AI) tools. Together they paint a picture of a battlefield that is increasingly saturated with and dominated by the presence of uncrewed machines.