APT28, a Russian hacking group, has been tied to attacks against the country of Georgia, Eastern European political and military organizations, and NATO. The group, FireEye said, operates as a professional team with indicators of long-term software development planning and operational security tactics in place. They operate during business hours, on Moscow time, and use phishing lures specific to government and military officials of political and strategic value to the Russian government. The same group is also known as Sofacy and may have ties to the MiniDuke campaign.
Source: https://threatpost.com/russian-apt28-group-linked-to-nato-political-attacks/109049/