France has carried out its first air strikes against Islamic State militants in Syria.
French planes destroyed a training camp in the eastern town of Deir al-Zour, President Francois Hollande said.
A US-led coalition has been carrying out air strikes against IS in Syria and Iraq for more than a year.
Speaking in New York, Mr Hollande said a political solution was needed to end the Syrian crisis, but President Bashar al-Assad could not be part of it.
France, like the UK, has previously confined its air strikes against the Islamic State group to Iraqi airspace.
The UK announced earlier this month it had carried out a drone strike against two British citizens in Syria but has yet to fly manned operations in Syrian airspace.
France had previously maintained that international law prevented it from attacking targets in Syria – Paris was adamant that it would do nothing to help, even indirectly, the Assad government, says the BBC’s Hugh Schofield in Paris.
But the French government has now accepted that getting rid of Assad is no longer the priority and the fight against IS trumps everything else, our correspondent says.