Its contracts damage their vital interests.
It's bad luck for German tankmakers. But those tanks are just hunks of metal if they can't be used.
It kinda seems Germany can't help itself. It has this national character that they wish to control their neighbours. Now it's pacifism and appeasement, which leaves them defenceless against Russia.
Countries like Finland, Spain and Poland, as well as Ukraine, are bound to look for new suppliers from now on.