Aside from these bilateral agreements, Vietnam is a signatory to numerous international agreements on biological weapons, chemical weapons, civil aviation, counterterrorism, diplomatic immunity, nuclear nonproliferation, and war crimes. Notable agreements on the environment include the following: Convention on the Prohibition of Military or any other Hostile Use of Environmental Modification Techniques (1978), Convention on Early Notification of a Nuclear Accident (1986), Convention on Assistance in the Case of a Nuclear Accident or Radiological Emergency (1987), Convention for Protection of the Ozone Layer (1988), Montreal Protocol on Substances that Deplete the Ozone Layer (1989), and United Nations Framework Convention on Climate Change (1994).