news Russia's latest strategy shift in Ukraine explained

The Ukrainian strategy has been similar to what the Iraqis used during the 2nd Gulf War. Let the armor pass and then attack the lightly defended supply columns that follow later. They have also been blowing up bridges and putting up roadblocks in the path of Russian armor and then bookending the Russian columns that have been road-bound because they are afraid of getting bogged down on soft ground. The Ukrainians hit the beginning and tail of the column to prevent retreat and then hit them with airstrikes, artillery, or wait until dark and attack with infantry. This is why the Russians have bogged down. Dispersing their armor into the countryside to avoid attacks won't work because when the Rasputitsa starts they will end up bogged down in the mud and their supply trucks won't be able to follow them.

Right now the Russians don't have enough supply vehicles and moving their armor into the countryside will actually increase rather than decrease fuel consumption and make their armor even harder to supply. Also dispersing your forces doesn't make it any easier to form a defensive perimeter and the Ukrainians will be able to surround, isolate, and destroy small units by using woods, swamps, and ravines to conceal their movement. Considering how poorly Putin has done launching an attack way too late in winter and the fact that Spring rains will further immobilize his already stranded armies in the field. It will be really cute when the Rasputitsa kicks in and Putins armies starve to death in the field.