Are they intentionally trying to demolish all the good will they've been trying to build up in Africa? For what, the relative pittance Ukraine would get selling it?
If you follow Russia's actions with regard to Ukraine, the only thing that makes sense is the Russian desire for the total annihilation of Ukraine and its people.
Allowing trade to continue would mean other nations could still see value in Ukraine... existing.
Russia is severing that relationship between Ukraine and the world as much as possible.
In short, Russia is simply lashing out in every way they know how. This is total war, and Genocide is on the line.
We have allowed it to continue for far too long, Russia believes they can win a war of attrition. Russia outnumbers what remains of Ukraine by roughly 5 to 1.
Russia hopes to one day own that land, ALL of that land, and control much of the world's food supply along with it.
Once that is done... Africa will be begging Russia for food.