AFAIK this was tit-for-tat: HU & PL closed/sold-off their industry in favor of WEU in exchange for subsidies. Removing these subsidies for any reason would violate the main economic agreement between them and EU. Mind you, there is no significant locally grown industry in those countries anymore (outside of a few state-owned industries), WEU profited from this enormously, especially Germany. As economic potential of this arrangement has been exhausted after 25 years already, incorporating UA is the next move to give EU (primarily DE/FR/NL) some nice economy boost for the next 10 years. EU is essentially playing Sim City.