sentences:  A series of distributed denial of service cyber attacks began on 27 April 2007 that swamped websites of Estonian organizations, including Estonian parliament, banks, ministries, newspapers and broadcasters, amid the Estonian-Russian row about the Bronze Soldier of Tallinn relocation.Estonian officials accused Russia of unleashing cyberwar.An exhibition dedicated to the Ukrainian Insurgent Army opened in Tallinn in October 2009 was heavily criticised by Russian embassy in Estonia.