David Cameron has for the first time opened a legal path to strike Islamic State (Isis) inside Syria by saying Bashar al-Assad's government is illegitimate.
He suggested the west would not need an invitation from Assad under international law to strike at Isis within Syrian borders.
Speaking at the start of the Nato summit in Wales, Cameron ramped up the case for UK involvement in air strikes in Iraq, saying that Isis represented a direct threat to the UK – and that decisions on strikes would be taken if they were in the national interest.
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