The madness angle goes nowhere useful, it remains more useful to look at the strategic stuff via testimony like the following instead:
Its from the start of February and it includes stuff about Georgia, Armenia and Belarus, as well as the Kremlins perception of the USA and Europe. Its got plenty of stuff in it that demonstrate why Putins Russia sensed a window of opportunity was there to be exploited, and also some of the ways they may have miscalculated.
Fiona Hill testifies before the U.S. Commission on Security and Cooperation in Europe on Russia's assault on Ukraine and the international order.
www.brookings.edu