Doomsday cult leader Shoko Asahara and several followers were executed for their roles in a deadly 1995 gas attack on the Tokyo subways and other crimes, Japanese media reported.
Two Britons became critically ill after an apparently chance encounter with the poison near the site of the March attack on Sergei and Yulia Skripal.
A British woman and man were hospitalised after being found unwell on Saturday near Salisbury where a former double agent Sergei Skripal and his daughter were attacked in March.
Sergei Skripal and his daughter were found unconscious following an alleged nerve agent attack in Salisbury in UK in March. Britain blamed Russia for the attack. Moscow retaliated in kind.
Britain says Yulia and her father, Sergei Skripal - a former Russian spy - were poisoned with a nerve agent. London blames Moscow for the attack. Russia denies the allegation which has plunged relations with the West to a post-Cold War low.
Russia last week ordered 60 US diplomats to leave the country in tit-for-tat retaliation over the alleged nerve-agent poisoning of an ex-Russian spy and his daughter in Britain. Meanwhile, Russian foreign minister has called the poisoning "staged".
Scores of foreign ambassadors receive notices to leave the country, in a move that comes as retaliation for the coordinated expulsion of over 150 Russian diplomats by the UK and its allies.
Russian ex-spy Sergei Skripal and his daughter Yulia were left critically ill in a nerve agent attack three weeks ago that most probably took place at the front door of their home in southwestern England.
The March 4 attack on the Skripals in the English city of Salisbury has provoked a major response that has seen more than 150 Russian diplomats expelled from countries around the world.
Relations between London and Moscow have crashed to a post-Cold War low after an attack on an ex-Russian spy, the first known offensive use of a nerve agent in Europe since World War Two.
The move is in reaction to Britian's earlier decision to expel 23 diplomats over the alleged use of a nerve agent against a former Russian military intelligence officer who worked for British intelligence.
Ties between the two countries deteriorate rapidly in the 10 days since Russian ex-spy Sergei Skripal and his daughter Yulia were attacked with a nerve agent in Salisbury, southwest England.
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