They are afraid of https://en.wikipedia.org/wiki/Buk_missile_system a very good technology that the Soviet Union developed which punches above its weight in situations like the Ukraine war because the mobile radars are hard to suppress with these methods https://en.wikipedia.org/wiki/Suppression_of_Enemy_Air_Defen... I have seen a huge number of Buks in various conditions in video footage from the war, one of them wa…
If that is the case, why would officials and experts be "stumped"? This seems like the obvious explanation.
FTA: the issue is that Russia made a huge show of force at the start of the invasion but has apparently held back from actually using much of it (by air or ground). This war could have been over the day it started if Russia had used maximal force, and the conservative approach their actually using maximizes risks and casualties.
And that's what has the experts confused: they can't figure out why Russia is going with this strategy, given the overwhelming technological and numerical superiority of the invasion force and their apparent willingness to accept casualties as the cost of conquering Ukraine.
It doesn't appear to be cost, because the invasion has "cost" Russia hundreds of billions.
It doesn't appear to be casualties/morale, because Russia has suffered 500+ casualties in 3 days (its worst losses since Afghanistan), and is still invading.
It doesn't appear to be doctrine, because their actions don't match what is known of Russian ground or air doctrine.
And so experts are trying to figure out what calculus went into Russia's invasion planning (assuming there was a coherent strategy going in, which is not a given in the post-Trump world).