In particular, as part of a more qualitative approach, one needs to have a look whether the current perceived «turbulences» have also by now reached the more fundamental layers of international law,
i.e. meta - rules such as the ones on sources, State responsibility, State immunity, treaty interpretation, or
res judicata effect of international court decisions must
be abided by the parties involved, to name but a few, the general acceptance of which
is indispensable for a functioning international legal system.