Dutch Defense Minister Ank Bijleveld says Russia's military intelligence unit made a cyber attack targeting the international chemical weapons watchdog and the investigation into the 2014 Malaysian Airlines crash over Ukraine.

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"We have been aware of the interest of Russian intelligence services in this investigation and have taken appropriate measures," she said on Thursday, according to the Associated Press.

"We remain very alert about this," she added.

Bijleveld also said the GRU's hacking attempts on the Organization for the Prohibition of Chemical Weapons, which she said took place in April, were disrupted by authorities. Four Russian intelligence officers were immediately expelled from the Netherlands, she said.