I blogged previously about David Kilcullen's book. Not done yet.
Interesting discussion of the Russia military, particularly in light of their performance in the Ukraine. One striking bit is the idea of "escalate to descalate"--fast, aggressive strikes to establish a position where resistance is unlikely.
One example was the Georgian war. It seems as if the original Russian plan for Ukraine 2022 was the same--a fast strike to decapitate Ukrainian leadership, take Kyviv before NATO could respond. There's also the possible use of nuclear weapons--small nukes (300 ton TNT equivalent)--use them early betting that retaliation will be hindered by the need for an alliance to coordinate.
Kilcullen describes the evolution of the Russian military since the breakup of the Soviet Union, but might have been surprised that the reforms haven't been as effective in Ukraine as they were thought to be.