That's a strange argument to make. Once these fertile soils become usable it is preferrable to have these resources inside the EU, not outside of it. And if you're worried about competition in the agricultural sector inside the of EU, then you could as well be concerned about a few other countries in the EU right now.
https://en.wikipedia.org/wiki/Chernozem#/media/File:Chernoze...
https://www.washingtonpost.com/world/2023/12/15/ukraine-memb... https://www.reuters.com/markets/commodities/ukraine-says-pol... It will probably destroy all non Ukrainian farms for grain and might even do it for specialty foods because it's hard to complete with (guessing) 40% black soil verus 1% or less. They can grow for a very long time with no need for crop rotation or fertilization.
https://en.wikipedia.org/wiki/Chernozem?useskin=vector#/medi...
(and wouldn't that be an incentive for Russia and Canada to have the world warm up?
When clearly at least one other country has even more black soil?
>Chernozem layer thickness may vary widely, from several centimetres up to 1.5 metres (60 inches) in Ukraine
How do you know it's incomparable?
That statement would still hold for other countries with layer thicknesses in the 1m to 1.5m range. Which seems entirely comparable considering the area covered is multiple times greater.