It’s all maneuver warfare. Scot Ritter on Twitter has a great thread about. Basically Russia had mobilized 200k soldiers against Ukraine which has 600k+ fighters. They did feints to bog down Ukrainian forces from sending reinforcements to the Donbass. The first phase was to create a land bridge from Crimea to Russia. Second phase is an all out offensive into the Donbass region to encircle and destroy the 70-100k Ukrainian fighters there. Next step after that is to take the cities one by one in the south and East. There is a reason why they bombed fuel depots because with no fuel the Ukrainians are stuck and can move their forces to reinforce or launch counterattacks.