Britain and France are expected to argue that current sanctions are not working and call for the embargo to be altered at a meeting with European Union foreign ministers in Brussels.
Mr Hague's calls look set to be rejected with several EU countries - including the Netherlands, Sweden and the Czech Republic - opposed to the plans over fears the weapons could fall into the hands of Islamic extremist groups.
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It is said that the teenager attacked and raped the woman, in her forties, on April 19 near to a park in Kidbrooke, south-east London.