All you need to know about the VX chemical weapon used to kill Kim Jong-Nam

It is extremely lethal; 10 milligrammes on the skin will kill you

A preliminary report from Malaysian authorities has found that Kim Jong-nam, the half-brother of North Korean dictator Kim Jong-un, was killed by the banned nerve agent VX.

He died on his way to hospital from Kuala Lumpur airport on February 13 2017. It’s claimed that two women, who have now been detained, rubbed the chemical on his face.

We asked a pharmacologist to explain what the nerve agent involved is and how it works; and an expert in international law to examine the implications of an assassination using a banned chemical weapon