German security authorities have helped to shut down a Russian computer espionage network in a US-led operation that uncovered, in part, spying about Germany’s plans for Ukraine, the Interior Ministry said on Saturday. The hacker group APT 28 had installed malware on hundreds of small routers in offices and private homes on behalf of the Russian military intelligence service, the GRU, it explained. The hackers had used the international infrastructure to attack German targets over the past two years including about German policy and supplies for Ukraine, the Interior Ministry spokesman said, c…