French President Francois Hollande has called on British MPs to back military intervention in Syria "in solidarity with France".
The French president thanked Britain for the support it has shown his country following the Paris attacks and said he hoped that the British parliament would now back the case for airstrikes put forward by Prime Minister David Cameron.
Mr Hollande told a press conference at the Commonwealth Heads of Government Meeting (Chogm) in Malta: "I do hope that the House of Commons will be able to meet the request of Prime Minister Cameron."
"David Cameron told me that he would consult parliament to take part in strikes in Syria. And win over the House of Commons," Mr Hollande said.
"I can only call on all British members of parliament, in solidarity with France but, above all, conscious of the fight against terrorism, to approve this intervention," he added.
His intervention comes one day after Mr Cameron set out his case for airstrikes to MPs, warning them that Britain is at risk of attack and insisting the military operations to defeat IS cannot be left to other countries.
But the prospect of a vote has plunged Labour into chaos as shadow cabinet ministers clashed with leader Jeremy Corbyn after he ruled out supporting action.
Mr Cameron had urged Labour MPs to back military intervention in Syria, telling them to "vote on the basis of the arguments".
Mr Cameron said there was a "compelling" case for airstrikes and insisted MPs would allow the country to do the "right thing" if they supported them.
A British parliament vote is expected to be held early next week.
Earlier today in Paris, Mr Hollande described those who carried out the Paris attacks as acting in the name of an "insane cause and betraying their God".
A solemn ceremony was held for the victims of the attacks, with Mr Hollande vowing that France would respond to the "army of fanatics" with more songs, concerts and shows.
"We will not give in either to fear or to hate," he said in the courtyard of the Invalides buildings in central Paris, speaking to 2,000 dignitaries and those injured in the violence as well as relatives of those who died.
"To all of you, I solemnly promise that France will do everything to destroy the army of fanatics that committed these crimes," he said.
The ceremony began with the president's arrival to the sound of the national anthem La Marseillaise being played by the Republican Guard.
Photos of the 130 people killed in the attacks of 13 November played on a black screen, while singers gave a stirring rendition of the classic ballad 'Quand on n'a que l'amour' ('When All We Have Is Love') by Belgian songwriter Jacques Brel.
Mr Hollande said "130 destinies had been stolen, 130 laughs that will never be heard again," adding that they had come from more than 50 places in France and 17 countries.
The majority of the victims were under 35 years old, he said, highlighting that the attacks targeted popular nightlife areas of the French capital, including bars, restaurants and a concert hall.
"It's because they represented life that they were killed, it's because they represented France that they were slaughtered, it's because they represented freedom that they were massacred," he said.
Among the crowd were some of the 350 people injured in the attacks, many in wheelchairs.
The coordinated suicide bomb and gun attacks on bars and restaurants, a concert hall and the Stade de France stadium two weeks ago were the worst ever terror attacks on French soil.
They were claimed by IS, and have been described as a declaration of war by Mr Hollande.
The attackers acted "in the name of an insane cause and a betrayed God," said Mr Hollande.
