Russia has denied producing or researching nerve agents known as Novichok. Russia was once believed to possess thousands of tonnes of weaponised Novichok varieties and their precursors. Watch report.

Russia denies producing Novichok: West spreading misinformation

Russian opposition leader Alexei Navalny has now alleged that Western laboratories has found the traces of Novichok found 'in & on' his body. The Putin critic even demanded that Moscow should return his clothes.

Russia: Navalny says Novichok found 'in & on' his body, his clothes are important evidence

In Russia, the chemist who was part Soviet's programme to develop the Novichok agent has apologised to prominent Kremlin critic Alexei Navalny after Novichok traces found in his body.

Russia: Novichok developer apologises to Navalny after Novichok traces found in his body