If not exporting the arms wouldn't make a difference, it won't make a difference. Modern weapons systems are very complicated and most importers require a cont

If not exporting the arms wouldn't make a difference, it won't make a difference. Modern weapons systems are very complicated and most importers require a continued dialogue with the exporting country -- with technical staff but also officials of various kinds -- to be able to keep things working. This allows the arms exporting country to maintain political influence and leverage. In an environment where other, hostile exporters would be happy to take one's place, maintaining that influence is an important practical concern.