These are tricky times for Russian President Vladimir Putin. The “special military operation” he launched against Ukraine in 2022, intended to last a few days until a puppet regime in Kyiv could be installed, has now gone on longer than both the Soviet fight against Nazi Germany and all of World War I. His forces have long ceased making significant gains on the battlefield; some data even suggest that Russian forces lost territory in April and May. What gains the Russians have made have come at enormous cost: Last month, Anna Keast-Butler, the director of British intelligence agency GCHQ, cited...