You can't really fault him for the exploitation because no leader now goes that far into the economical weeds. His advisors fucked up and in a better world they would be executed like they do it in China with administrative failure of the highest level. Why they did not take Königsberg I don't know. of course I would have wished a transaction of that kind to have taken place. On the other hand, Kohl wanted to send the Turks home, his senility (probably due to his fatness) prevented him from play a more prominent role in his final years.