United states has decided to impose fresh sanctions on Russia to punish it for using a nerve agent, a chemical weapon, against a former Russian agent in Britain early this year.
About:
They are highly toxic chemicals that prevent the nervous system from working properly.
They disrupt normal messaging from the nerves to the muscles. This causes muscles to become paralysed and can even cause death.
These are among the most lethal chemical weapons and their use is banned under the Chemical Weapons Convention (CWC).
Forms: Nerve agents take different forms - including powder and gas - but they tend to be a liquid, which can seep through the skin.
Earlier instances of using nerve agents:
Last year, the half-brother of North Korean President Kim Jong-un was killed by a nerve agent in an attack in Malaysia.
According to UN, Syrian government used them in 2013 and 2017, killing hundreds.
Novichok is a series of nerve agents developed by the Soviet Union and Russia between 1971 and 1993.
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