In Russia, the slow going and the heavy toll of President Vladimir V. Putin’s war on Ukraine are setting off questions about his military’s planning capability, his confidence in his top spies and loyal defense minister, and the quality of the intelligence that reaches him. It also shows the pitfalls of Mr. Putin’s top-down governance, in which officials and military officers have little leeway to make their own decisions and adapt to developments in real time.

The failures of Mr. Putin’s campaign are apparent in the striking number of senior military commanders believed to have been killed in the fighting. Ukraine says it has killed at least six Russian generals, while Russia acknowledges one of their deaths, along with that of the deputy commander of its Black Sea fleet. American officials say they cannot confirm the number of Russian troop deaths, but that Russia’s invasion plan appears to have been stymied by bad intelligence…

The failures in Ukraine have started to create fissures within Russian leadership, according to Andrei Soldatov, an author and expert on Russia’s military and security services. The top Russian intelligence official in charge of overseeing the recruitment of spies and diversionary operations in Ukraine has been put under house arrest along with his deputy, Mr. Soldatov said. Even Russia’s defense minister, Sergei K. Shoigu, who vacations with Mr. Putin and has been spoken of as a potential presidential successor, has suffered a loss of standing, according to Mr. Soldatov’s sources.

“It looks like everybody is on edge,” Mr. Soldatov said.