There is no sheriff in Germany. In order to seize an asset, one needs a valid court title, which means that the case has already been ruled in first level of jurisdiction. The creditor can then enquire to execute the claim and the court's marshal will then according to the court title proceed with seizure. However, in order to execute a seizure, the creditor must deposit the claim's value at court in order to cover possible costs of execution. Especially the last part is a very big barrier to proceeding claims in Germany. Since it has been ruled by the arbitrary court in Geneva, there must have occurred a pretty long run-up in order to transform the international ruling into German law. Due to the (automatic) court processes, a political influence appears rather difficult, although I would not rule it out.