Also we read the warning as "don't buy from them, rather buy from us".
And it was extensivly debated in general.
The EU kept at it with plans to expand until the war started for the second time and “someone” took it upon themselves to violently sever that link.
Now at latest by 2014 that should have changed indeed. But even then different approaches would have been possible then cutting all ties and hope this will work out better.