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The Foreign Secretary has rejected the suggestion that Britain needs to work with Syria's President Assad to defeat the terrorist threat posed by Islamic State.
Speaking on the World at One, Philip Hammond refuted the claims by Lord Dannatt that "my enemy's enemy is my friend".
"It would poison what we are trying to achieve if we were to align ourselves wih President Assad," Mr Hammond said.
Earlier, the former British Army chief called on the UK Government to engage with the Syrian regime to confront religious extremism in the Middle East.
He told BBC News that the UK shouldn't rule anything in, or rule anything out, including military action.
He said that David Cameron declaring "no boots on the ground" was an "arid" thing to say as the situation kept changing.
Sir Malcolm Rifkind, Chair of the Intelligence and Security Committee, told the World at One that the Government needed to be "harshly realistic" about the situation in Iraq, and hinted that the UK might be forced to work with Syria's President Assad.
"We’ve got to be serious about it and swallow hard as to what is required," he said.
A new poll for ITV has concluded that around half of Brits surveyed think that there should not be British troops on the ground in Iraq, while around a quarter feel that there should be.
Meanwhile the United States is reportedly getting 'ready' to further confront Islamic State because it poses an 'apocalyptic' threat to the West.
America's top general Martin Dempsey said IS could only be defeated by attacking their base in Syria whilst Defence Secretary Chuck Hagel warned that the terrorists would regroup following successful US airstrikes against them.
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