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              Congressional
            ~.Research Service






Resurgence of Chemical Weapons Use:

Issues for Congress



Updated March 5, 2021

With increasing numbers of incidents, the use of chemical weapons (CW) has become a growing
international concern two decades after the international community decided to ban them under the 1997
Chemical Weapons Convention (CWC). Syrian government forces have used the nerve agent sarin and
chlorine bombs dozens of times since 2013 in that country's civil war. The Islamic State used mustard gas
in northern Iraq in 2015 and 2016. North Korean agents used the nerve agent VX to assassinate Kim Jong
Nam, the half-brother of the North Korean leader, at the Kuala Lumpur International Airport in February
2017. Russian agents used the Soviet-developed Novichok-class nerve agent in an attempted
assassination of a former Russian spy Sergei Skripal in the United Kingdom in March 2018. Russian
opposition figure Alexei Navalny survived an August 2020 Novichok-class nerve agent poisoning, also
likely perpetrated by Russian intelligence agents, according to the State Department. Prior to the Syrian
civil war, there had been no major recent use of chemical weapons since the 1995 terror attack by the
Aum  Shinrikyo in Tokyo and by Iraq in the 1980s during its war with Iran. Some argue that the lack of
accountability for such incidents undermines the international norm against chemical weapons.
The Organization for the Prohibition of Chemical Weapons (OPCW), originally established to oversee the
destruction of chemical weapons stocks under the CWC and promote the safe and peaceful use of
chemicals, now has additional challenges and responsibilities. States may request OPCW assistance in
investigating cases of CW use. CWC states may also request challenge inspections at facilities in member
states suspected to be in violation of the convention. To date, the CWC challenge inspection provision has
never been invoked.
After the use of nerve agent on its territory, the UK called for a Special Session of the OPCW Executive
Council in June 2018 to highlight the gravity of chemical weapons use and to call for giving investigators
the mandate to attribute an attack when possible. CWC member states approved a decision that granted
the OPCW  the added authority to attribute chemical attacks under investigation. In addition, the CWC
states in November 2019 adopted two decisions that amended Schedule 1 of the CWC's Annex on
Chemicals, adding two classes of nerve agents developed during the Cold War-the Novichok class of
nerve agents as well as some carbamate compounds to the schedule, subjecting them to the CWC's
declaration requirements and other restrictions. Use of Novichok and carbamate compounds as a weapon
was already prohibited under the CWC.

                                                                Congressional Research Service
                                                                https://crsreports.congress.gov
                                                                                     IN10936

CRS INSIGHT
Prepared for Members and
Committees of Congress

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