Defence procurement bungles and wins

[Mav]

By the way, although there has been a surprising reliance on Russia's conscripts and volunteers, Putin did send in the spetnaz special forces but I imagine the losses they suffered resulted in more reliance being placed on mercenaries and conscripts:

When President Vladimir Putin launched his war on Feb. 24 after months of buildup on Ukraine’s borders, he sent hundreds of helicopter-borne commandos — the best of the best of Russia’s “spetsnaz” special forces soldiers — to assault and seize a lightly defended airfield on Kyiv’s doorstep.
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On the first morning of the war, Russian Mi-8 assault helicopters soared south toward Kyiv on a mission to attack Hostomel airfield on the northwest outskirts of the capital. By capturing the airfield, also known as Antonov airport, the Russians planned to establish a base from which to fly in more troops and light armored vehicles within striking distance of the heart of the nation’s largest city.

It didn’t work that way. Several Russian helicopters were reported to be hit by missiles even before they got to Hostomel, and once settled in at the airfield they suffered heavy losses from artillery fire.

An effort to take control of a military airbase in Vasylkiv south of Kyiv also met stiff resistance and reportedly saw several Russian Il-76 heavy-lift transport planes carrying paratroopers downed by Ukrainian defenses.

Although the Russians eventually managed to control Hostomel airfield, the Ukrainians’ fierce resistance in the capital region forced a rethinking of an invasion plan that was based on an expectation the Ukrainians would quickly fold, the West would dither, and Russian forces would have an easy fight.

Russia's Failure To Take Down Kyiv Was A Defeat For The Ages, Huffpost.