The UK is “letting down” its allies by failing to launch air strikes against terrorist group Islamic State in Syria, says Britain’s top military commander.
General Sir Nicholas Houghton, the chief of the defence staff, criticised the UK policy of restricting RAF air strikes to neighbouring Iraq.
He told Sky News the decision “makes no sense” when IS, also known as Isil, has its stronghold in Syria.
MPs rejected possible UK military action in Syria in 2013.
The government remains committed to action in Syria – but will not order air strikes until it is confident it can win a vote in the Commons authorising them.
About 30 Conservative backbenchers would be likely to vote against military action and ministers are not convinced they can persuade enough of them to change their mind, or get enough Labour MPs to back their case, to win a vote.
Foreign Secretary Philip Hammond said: “The Labour Party is a different organisation to that which we faced before the summer.
“We need to understand where the Labour Party is on this. At the moment even its leader doesn’t always agree with its policies.
“There is an exploration process here of understanding whether the majority of Labour MPs would, in fact, back this action.”
Mr Hammond told the BBC’s Andrew Marr show Britain saw “eye-to-eye” with the Russians on lots of things in Syria, such as “the need to destroy Isil” but he added: “The one thing we disagree on is the future of Bashar al-Assad.
“We and most of our allies believe he needs to go at a point in the transition.”
Defence Secretary Michael Fallon has said it is “morally indefensible” for Britain to rely on other countries to tackle the so-called Islamic State in Syria.