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By Alastair Macdonald and Andreas Rinke BRUSSELS (Reuters) - The European Union threatened Russia with new trade sanctions if Moscow fails to start reversing its action in Ukraine, but sharp divisions among leaders at a summit in Brussels left the timing of any measures uncertain. After a lengthy briefing by Ukrainian President Petro Poroshenko, who warned "full-scale war" was imminent if Russian troops continued an advance in support of pro-Moscow rebels, the EU leaders agreed on Sunday to have officials draw up within a week a list of new measures that could hit a range of sectors. The European Council called on Russia "to immediately withdraw all its military assets and forces from Ukraine" and urged a ceasefire.
The United States has launched a social media offensive against the Islamic State and Al-Qaeda, setting out to win the war of ideas by ridiculing the militants with a mixture of blunt language and sarcasm. Diplomats and experts are the first to admit that the digital blitz being waged on Twitter, Facebook and YouTube will never be a panacea to combat the jihadists. For the past 18 months, US officials have targeted dozens of social network accounts linked to Islamic radicals, posting comments, photos and videos and often engaging in tit-for-tat exchanges with those which challenge America. At the US State Department, employees at the Center for Strategic Counterterrorism Communications (CSCC), created in 2011, manage an Arabic-language Twitter account set up in 2012 (https://twitter.com/DSDOTAR), an English-language equivalent (https://twitter.com/ThinkAgain_DOS) and a Facebook page, launched this week, (https://www.facebook.com/ThinkAgainTurnAway).