A full-scale Russian invasion into Ukraine on 24th of this year was a surprise for many people, for others the logical consequence of the concentration of Russian troops and the designation by the Russian Federation (three days earlier) of the "independence" of pseudostates: Donetsk and Lugansk People's Republics. The course of combat amazed even more observers, including experienced analysts. What lessons can be drawn, or even learned, from what has been fought?
