I'm not sure it stacks up as a land-grab - Putin is expending a lot of political capital for some wheat-fields and combine harvesters.
This was about 'Denazification' a week ago, so whatever reason they were planning on spinning to the Russian populace is possibly out of date.
None of this makes any sense at all. I'm still not convinced he isn't working an angle, even with the supposedly poor performance of the Russian military to date.