Why is Turkey attacking Syria? Mark Lowen explains

Syrian pro-government forces will help Syrian Kurds fighting against a Turkish offensive in north-west Syria, Syria’s state news agency reports.

It comes after Syrian Kurdish officials said the government in Damascus had agreed to send troops.

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http://www.bbc.com/news/world-middle-east-43107013?mktcid=nled&mktcval=107&kid=_2018-2-19