Dutch security services expelled four Russians in April over a plot targeting the global chemical weapons watchdog, officials said.
The cyber operation by Russia’s GRU military intelligence targeted the Organisation for the Prevention of Chemical Weapons (OPCW) in The Hague, Dutch officials said.
The OPCW has been probing the chemical attack on a Russian ex-spy in the UK.
It has also been investigating alleged chemical attacks in Syria.
Russia has always denied carrying out any chemical attacks.
Source BBC News