Maybe my western lens is obscuring my thoughts but sending in young conscripts to 'test out defenses' will only result in high numbers of casualties and body bags being sent back to Russia which surely can't be good? Better send you best forces in first and secure the strong points/bridge heads and let the rest of army storm through? Anyone those paratroopers at the airport near Kviv certainly won't be conscripts.
Well if it is accurate then maybe Putin felt the risk of Ukraine's far more battle-ready position and armaments made him reluctant to send in his carefully crafted elites after expending the effort in South Ossetia/Donbas/Syria/other areas to gain experience