FILE PHOTO: A Ukrainian national flag flies in front of the government building in central Kiev, Ukraine, March 3, 2016. REUTERS/Valentyn Ogirenko//File Photo
LONDON (Reuters) - Russian mercenaries with ties to Moscow's spies have increased their presence in Ukraine in recent weeks, stoking fears among some NATO members that Russia could try to engineer a pretext for an invasion, three senior Western security sources said.
They said their concerns had strengthened in recent weeks that a Russian incursion into Ukraine could be preceded by an information war, and cyber attacks on Ukraine's critical infrastructure such as electricity and gas networks.
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