The drawbacks of the instruments establishing liability regimes at the State-to-State level, are that they rely on the traditional law of State responsibility under which a State may successfully challenge the imputability to it of the wrongful acts [wrongful act] committed by its organs or instrumentality; or decline to offer diplomatic protection to its natural or juridical persons in an international tribunal (the only procedure available), against another State that has violated its obligations under the instrument to the detriment of such natural or juridical person. Most importantly, under State-to-State liability regimes, innocent victims [victim] of injurious consequences [injurious consequence] of an activity (tobacco use) may be left uncompensated where the State causing [cause, to] the harm is shown to have met its due diligence obligations in accordance with international law.