Newspaper headlines: 'Brink of war', Paris climate talks and Yorkshire Ripper 'back to prison'
Most of Tuesday's papers focus on what they see as imminent UK air strikes in Syria, with a vote due in the House of Commons on Wednesday.
David Cameron called the vote - and the Guardian says he was "freed" to take that step when Labour leader Jeremy Corbyn allowed his MPs a free vote.
This followed a "fractious" meeting of the shadow cabinet at which Mr Corbyn was "forced into an about-turn" on his plan to order MPs to oppose air strikes, the Telegraph says.
The meeting descended into a "shouting match" and a majority of the shadow cabinet refused to leave until Mr Corbyn dropped a plan to make opposing military action an official party policy, the Independent reports.
It says Mr Corbyn and shadow foreign secretary Hilary Benn will "argue against each other from the front bench" over Mr Cameron's plan to bomb Islamic State (IS) militants.
Several papers suggest bombing could begin within hours if MPs approve military action.
The Daily Mail says eight extra UK jets could be sent to Cyprus, joining eight already stationed there for missions over Iraq.
It says Britain will bring laser-guided Brimstone missiles to the fight against IS - but "as few as 10" may be available, which "raises doubts" about what contribution the RAF can make.
Mr Cameron might have won the political battle - but the "real war is yet to come", the Telegraph warns.
It says there are "very reasonable concerns" about what happens next, particularly over what ground force might be assembled, the future of the Assad regime and plans to stop IS's ideology "erupting" elsewhere.
The Guardian says MPs should reject air strikes unless Mr Cameron can lay out a "wide-ranging international strategy" to defeat IS. It says he has so far failed to do this.
The paper quotes moderate factions in Syria who say bombing will be useless unless they get more support to fight IS and the Assad regime.
- If men are from Mars... then so are women, brain study finds - There is no such thing as a male or female brain, according to scientists who examined almost 1,400 brains and found no consistent differences between the sexes, the Times reports.
- The armed robbers in panda onesies - The Telegraph reports that two men in one-piece panda jumpsuits robbed a newsagent in Louth, Lincolnshire.
- 'Overweight haters' target women on Tube - Women on the London Underground are being handed cards telling them they are "fat, ugly humans" by a person or group claiming to hate overweight people, the Independent reports.
- Sunbedlam - Hundreds of holidaymakers made a 9am dash for poolside sunbeds at a Tenerife hotel because the area was locked overnight, the Sun says.
"Last haka for Jonah" is a headline in the Sun, as it reports a public memorial for New Zealand rugby legend Jonah Lomu, who died last month at the age of 40.
The Guardian says "elevens were everywhere" - a reference to Lomu's shirt number - at the event at Eden Park in Auckland.
It says dozens of current and former All Blacks players and coaches - as well as players from other countries - gathered to remember Lomu, who died of a cardiac arrest.
World leaders arriving at the UN climate conference in Paris were "confident of success", the Guardian reports.
The paper welcomes the "remarkable achievement" of getting pledges from the countries taking part - but it warns global warming will still be above the target level of no more than 2C if these are all met.
Writing in the Telegraph, Philip Johnston says even people who have been sceptical about climate change science should welcome the Paris talks. He says there is "sufficient worry" over the issue to mean "doing nothing makes no sense".
The Mail notes that the Paris summit itself will have a "huge negative impact" on the environment, with 50,000 politicians, activists and lobbyists travelling by car, train and even private jet to attend.
The race to choose a US Republican presidential candidate will "cast a shadow" over the talks, the Financial Times says, as candidates have vowed to overturn pledges made by President Barack Obama.
It publishes a graph contrasting the candidates' poll ratings with the accuracy of their statements on the science of climate change, as rated by eight scientists. The "hardliners" - like Donald Trump, who is "not a believer in climate change" - are polling better than those whose statements are rated as more scientifically accurate.
The Times and the Independent carry the same picture of what the latter calls a "frosty exchange" between Mr Obama and Russian President Vladimir Putin at the summit.
The men - whose body language displayed "mutual antipathy" - sat down for talks and "politely disagreed" over the conflicts in Syria and Ukraine, Charles Bremner writes in the Times.
Star Wars and sad seflies
"Leia strikes back" declares the Express, as it reports the "rage" of actress Carrie Fisher after film bosses "made her lose more than 35lb" to appear in the latest Star Wars film.
The actress says film executives only wanted to hire "three quarters" of her, the paper adds.
People taking selfies in London look "much more unhappy" than those in other cities around the world, the Guardian reports.
It says the finding came from analysis of 150,000 images posted on Instagram.
What the commentators say
'At long last'
Doctors believe Peter Sutcliffe - better known as the Yorkshire Ripper - is no longer mentally ill and should be transferred from Broadmoor high-security hospital to a prison, the Mirror reports.
It says the move would end the "cushy life" he enjoys - wording also used by the Sun, which says Sutcliffe has moaned that his situation is a "disaster".
The paper says sense has prevailed and "at long last" Sutcliffe, who was jailed in 1981 for murdering 13 women and attempting to murder seven more, could return to the "harsh jail he so richly deserves".
Making people click
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Express: Mafia take on ISIS
Telegraph: The end is nigh for climate-change activists