Z is not the main problem African nationals stuck in Ukraine are facing. I mentioned this Le Monde piece about students in Soumy. Also, this, from two academics at Central European University:

Of race and war: What the crisis in Ukraine tells us about ourselves

Our solution is not to care less about Ukraine -- rather we should be more attentive to security threats and war in other parts of the world. Indeed, one of the most powerful rebukes of Russian imperialism during last week's U.N. Security Council session came from Dr. Martin Kimani, Kenya's permanent representative to the U.N., who compared the plight of Ukrainians with the struggles of other post-colonial nations.

And only if we similarly broaden our consideration to include the peace and security of all nations can we count on broad support and cooperation in times of crisis.