A new front in the conflict in Syria now looks increasingly likely between Turkey, Syria and its ally Russia.
Turkey said it killed 50 Syrian soldiers near Idlib in retaliation for airstrikes that killed two Turkish troops.
And the UK's ambassador to the United Nations told Sky News that Russia was cynically exploiting the crisis, even as the numbers of refugees continues to grow.
Sky's Dominic Waghorn reports on the regional fallout - and the 'Diplomatic Battleground'.
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