Right. I’m sure that Ukranian publishers, under a hostile Ukranian government, will produce all the Russian books everybody wants.
You really don’t understand how things work. Russian books and culture will not be domestically produced. A ban on importation is a ban on the culture itself.
A ban on the culture is a defacto ban on the people.
There is a large Russian speaking population in Ukraine and thus a market for Russian language books. The language law specifically allows them to be published. Russian was not banned before the invasion and is thus is not a justification for it.