Ukraine hosted the final of the Champions League in 2018 (I think). Assuming that by 2030, they have all of their land back and are far enough along on the rebuilding, there would be a lot of sentimental/political reasons for awarding them a part of it. I suspect that is why Spain and Portugal added them to their joint bid.
The Olympic Stadium in Kyiv is beautiful, and before the Russian invasion, the stadium in Donetsk was almost as nice. Lviv has been almost untouched by the war, as have the cities near the Slovakian, Hungarian and Romanian borders.
If they do get the bid, I don’t think it would be wise to schedule any Russian, Belarusian, Hungarian or Iranian matches there.