As the world watches Russian soldiers and Russian-backed separatists occupy Ukrainian administration buildings, cities, and even an entire peninsula, a group of Ukrainian hackers is fighting back by launching an invasion of their own.
Since this summer, Ukrainian hacker Yevgeniy Dokukin and his group of fellow computer pros calling themselves Ukrainian Cyber Forces have carried out “Operation Bond, James Bond,” in which they leaked web camera and security footage from Crimea, separatist-held areas of eastern Ukraine, and even government offices in Russia. Dokukin and the Ukrainian Cyber Forces have been leaking videos from cameras for months now, including a video  supposedly from a separatist base in Donetsk.
A few weeks ago, Dokukin and his allies took up new weapons in their cyberwar: printers. In a series of Facebook  posts , Dokukin has explained how, after accessing private WiFi networks, the Ukrainian Cyber Forces were able to print documents on vulnerable networked printers in various offices in Crimea and separatist-held areas in eastern Ukraine, and were now trying to do the same in Russian networks.
— MustLive (@MustLiveUA) December 8, 2014 
#UkrainianCyberForces have begun occupying networked printers in Donbas and in Crimea.
As Dokukin told RuNet Echo, he sees the wasted ink and paper in Russia as a variant on Ukraine’s own “economic sanctions” aimed at its neighbor. The messages appearing on these printers vary, but they share a common theme:
Якщо ваш мережевий принтер передасть “вітання Путіну” чи надрукує “Слава Україні!” та інші цікаві надписи, то знайте, що він під нашим контролем.
If your network printer passes along “greetings to Putin” or prints “Glory to Ukraine!” or other interesting messages, then you know that it is under our control.
Not all of Dokukin’s printer messages were meant to be confrontational. Recently, the Ukrainian Cyber Forces accessed an open network printer in Canada —an especially strong ally of Ukraine throughout the ongoing crisis—and printed the message “Thanks for supporting Ukraine!” in English.
As Russia increases its support of information warfare, including slick redesigns of its news agencies  and propping up fake Ukrainian news sites , Ukrainian Cyber Forces are taking the trolling and information war to their opponents—and their offices—more directly.