The Dutch military intelligence service broke through a Russian cyber attack on the Chemical Weapons Organization, said the country's defense minister.
It is believed that the attack was carried out by the Russian military intelligence service GRU, which was also blamed by the British government for attacking Sergei and Juliet Skripal in Salisbury in March.
Dutch Defense Minister Ank Bijleveld said four intelligence officials were expelled from the Netherlands after being caught spying on the chemical weapons body in April.
The attack was thwarted with the help of British intelligence agents. Whitehall officials said the OVCW had investigated the attempted murder of Skripal and his daughter in the UK, as well as the bombing of the MH17, which was shot down in 2004 in Ukraine.
Dutch security services arrested four GRU agents "in flagrante" and immediately deported them to Russia, maintaining their technical equipment.
Sources also suggested that the GRU cybercrime unit, known as the "sandworm" by the international security community, had attempted a raid on Porton Down's chemical weapons facility in the UK at about the same time.
More details soon …