translate English to French: However, the problem arises if nationals themselves are not provided with the minimum substantive standards, in which case the principle would not guarantee any such minimum standards to foreign victims involved in the transboundary damage.
Or, le problème se pose si les nationaux eux-mêmes ne disposent pas des normes minimales de fond, auquel cas le principe ne garantirait pas ces normes minimales aux victimes étrangères touchées par le dommage transfrontière.