France is to ramp up its military efforts against so-called Islamic State in Iraq following the Bastille Day lorry attack in Nice.
President Francois Hollande announced that France would supply heavy weapons to Iraqi forces as early as next month.
But President Hollande said there are no plans to deploy troops on the ground there or in Syria.
Eighty four people died after Mohamed Lahouaiej Bouhlel drove a lorry into crowds on the Promenade des Anglais on July 14.
Five alleged accomplices have been charged with terror offences.
Video report by ITV News Europe Editor James Mates.
Francois Hollande today warned Theresa May that she cannot pick and choose among EU rules as the two met to begin talking over a Brexit.
The French president has been among the toughest of negotiators over Britain's planned EU exit.
Today his language was more conciliatory - but he stressed that the UK can't enjoy unfettered access to the single market unless it also allows free movement of EU nationals.
In turn, Ms May insisted that the UK will not be rushed into starting formal talks leading to a Brexit as she said it would take time to reach the right agreement.
Francois Hollande will tell Theresa May that Brexit talks must start quickly when the pair meet today.
The French president is expected to say he does not want there to be any "pre-negotiations".
Mr Hollande and the prime minister will hold talks on Britain's plans to quit the EU when they meet in Paris.
The French President will host a working dinner at the Elysee Palace, a day after Mrs May met German counterpart Angela Merkel.
At discussions in Berlin, the Chancellor said Britain should "take a moment" over its plans to sever its ties with Brussels but warned against leaving the negotiations "up in the air".
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President Hollande is holding a meeting with his security and defence team after the attack in Nice.
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