Hollande, heading to the U.N. General Assembly, also stressed the importance of seeking a political solution for Syria.
"More than ever the urgency is putting in place a political transition," including elements of the opposition and Assad's regime, Hollande said.
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France has remained opposed however to recent diplomatic suggestions of allowing Assad to stay in power for a limited time.
While no specifics were provided about the location or timing of the airstrikes, French military officials have said they would target IS training and logistical sites, according to French media report.
The French government has insisted that while it is part of the U.S.-led coalition, France is deciding who and what to hit independently.
Hollande
announced Sept. 7 that France would start airstrikes, days after the
photo of a dead 3-year-old Syrian boy galvanized public concern about
Syrian refugees.
In his
statement Sunday, Hollande said: "Civilian populations must be protected
from all forms of violence, that of IS and other terrorist groups but
also the murderous bombardments of Bashar Assad."