In the space of hours, Ukraine’s government, top energy companies, private and state banks, main airport, and Kyiv’s metro system all reported hits on their systems. The attacker was not immediately clear—Wired, in a recent story, described Russia as using its neighbor as a “test lab for cyber war,” but Moscow denies any part in past attacks. Its own state oil giant Rosneft also reported being hit by a cyberattack today; Rosneft’s website was unresponsive at time of writing. It’s unclear if the attacks are linked. Another Russian oil firm, Bashneft, has been hit too.

More at QZ.com