Image source, Anadolu

Turkish warplanes are reported to have shot down an unidentified military aircraft near the border with Syria.

A Turkish military official told the Reuters news agency that Turkish F-16s had fired on the jet after warning it that it was violating Turkish airspace.

Turkish media broadcast video footage, external of a plane crashing into mountains near the border with Hatay province.

Syrian and Russian military aircraft have been targeting jihadist militants and Western-backed rebels in the area.

Follow the developing story here

Today Programme
BBC Radio 4

Image source, PA

Later today, MPs are to take part in an SNP debate on the future of Britain's nuclear weapons system. There are questions over how Labour will vote, given the party's divisions over Trident.

BBC political editor Laura Kuenssberg says there will be a few people - such as former Culture Secretary Ben Bradshaw - who will vote with "the consistent party policy", to renew the weapons. But the numbers who will rebel against Jeremy Corbyn's efforts to make them abstain on the issue will be "quite small", about 20, she says.

However, the debate will put divisions within the Labour party "on full display", and the SNP will enjoy every moment of it, she adds.

The Commons vote - to be taken this afternoon - will not be binding on the government, as it is an opposition day motion.

Meanwhile, former Labour Defence Secretary Des Browne has warned that the Trident nuclear weapons system might be obsolete.

Today Programme
BBC Radio 4

The Children's Commissioner for England says the number of children being sexually abused is much higher than previously thought, estimating that only one in eight comes to the attention of the authorities.

Sue Crocombe, who was a victim of sexual abuse by a relative in her childhood, says her earliest memory of it was at four years old - and that it continued until her 13th birthday.

It has taken her counselling to see she was "not at fault", but "the shame and guilt you feel is huge", she explains.

She says children who are abused often will not speak about what's happening urges adults, teachers and parents to be vigilant. "Just ask the question," she says, if they spot signs of abuse.

Image source, Reuters

Away from the UK, the US has issued a worldwide travel alert for its citizens in response to "increased terrorist threats".

The state department said, external "current information" suggested the Islamic State [IS] group, al-Qaeda, Boko Haram and others continued "to plan terrorist attacks in multiple regions".

The alert, it said, will remain in place until 24 February 2016.

France, Russia, Mali and several other countries have seen deadly attacks in the past month.

More here.

Image source, Pacemaker

A team of detectives from police forces outside Northern Ireland is expected to investigate the activities of the army's most high-ranking agent within the IRA.

The agent, codenamed Stakeknife, stands accused of involvement in up to 50 murders.

He has been named by the media as former west Belfast man Freddie Scappaticci.

He has denied the allegations.

More here.

Today Programme
BBC Radio 4

The former Liberal Democrat leader Lord Ashdown has said air strikes in Syria will not succeed unless they are backed by clear legality, a wider coalition of support and a broader strategy for the future.

Speaking on Today, he criticised the government for failing to put pressure on Gulf states which he said were funding jihadism. 

Lord Ashdown said pressure on the Gulf States to stop funding jihadism should be a "crucial part" of the government's strategy and he called on the prime minister to launch an inquiry into the funding of jihadism.

Front-line NHS services in England will get a £3.8bn, above-inflation cash injection next year, amid mounting fears about the pressures they face.

The funding boost represents a rise of nearly 4% on NHS England's £101bn front-line budget this year.

The Treasury has agreed to the rise as part of the manifesto promise to give the NHS an extra £8bn a year by 2020.

Health chiefs had argued a significant rise was needed immediately as the NHS struggles to meet demand for services.

NHS trusts are heading for a deficit of more than £2bn this year as they fight to keep control of costs.

Missing targets

They are already missing many of their key targets covering A&E, ambulance response times and cancer care.

The plans for NHS spending over the next five years have been unveiled by chancellor George Osborne the day before the rest of the spending review announcement on Wednesday.

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Image source, Getty Images

The UK's Trident nuclear weapons system could be rendered obsolete by cyber attacks, former Defence Secretary Lord Browne has warned.

The ex-Labour minister told the BBC unless "weak spots" were protected, there was "no guarantee" of a reliable nuclear deterrent for the PM "when he needs to reach for it".

Ex-Conservative Defence Secretary Sir Malcolm Rifkind played down the risk.

The comments come ahead of an SNP-led Commons debate on the future of Trident on Tuesday afternoon.

On Monday it was revealed the cost of renewing the system had risen to £31bn.

The government also said the start date for the replacement submarines had been put back until "the early 2030s" as it unveiled its Strategic Defence and Security Review (SDSR).

Read more

Hello and welcome to our rolling coverage of political developments. You can catch up with all Monday's political developnments by scrolling down and you can listen to BBC Radio 4's Today as it is broadcast via the Live tab on this page (you can catch up on last night's Newsnight there too). We'll start with a round up of the main stories so far this morning.

Today's political news has been dominated by defence policy, with the publication of the government's Strategic Defence and Security Review. There's more to come on Tuesday, as the SNP stages a Commons debate on the future of the UK's nuclear missiles. It's likely to expose divisions within the Labour Party, whose MPs have been ordered to abstain. But some are keen to back what is the party's current position of Trident renewal.

We'll pick up coverage of this, and the rest of Tuesday's politics, before 08:00 GMT.

BBC Newsnight

Former Labour leader Ed Miliband has told Newsnight he is "yet to be convinced" on the case for air strikes in Syria.

He also said the decision as to whether Labour should have a free vote on Syria was "not a matter for me, that's a matter for Jeremy Corbyn and the shadow cabinet".

BBC Newsnight

The decision to give the activist at the centre of the Tory bullying scandal a formal role was approved by the party's senior management team.

BBC Newsnight has learned that both party chairmen and election chief Lynton Crosby were on the board which agreed to appoint Mark Clarke and fund his campaign.

It has also emerged that Grant Shapps, then Tory co-chair, personally read a highly critical report on Mr Clarke's behaviour during the 2010 election before agreeing to back Mr Clarke.

Mr Clarke denies all the allegations against him.

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The government is to invest £85 million a year in enhancing BBC services around the world including in Russia, North Korea, the Middle East and Africa.

The money is to help "build the global reach of the World Service" to half a billion people and "increase access to news and information".

Director general Tony Hall said he "warmly welcomed" the announcement.

The government will provide £34m between 2016-17 and £85m a year from 2017-18 for digital, TV and radio.

The next review of this funding will be in 2020.

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