Jangling nerves
Hollande will visit Putin in Moscow on Nov 26, two days after the French leader is due to meet US President Barack Obama in Washington to push for a concerted drive against Islamic State, which controls large parts of Syria and Iraq.
A French presidential source said Hollande also spoke by phone to Iranian President Hassan Rouhani, who backed calls for a united front against the militants.
In Brussels, Le Drian invoked the EU's mutual assistance clause for the first time since the 2009 Lisbon Treaty introduced the possibility, saying he expected help with French operations in Syria, Iraq and Africa.
"This is firstly a political act," Le Drian told a news conference after a meeting of EU defense chiefs.
The 28 EU member states accepted the French request but it was not immediately clear what assistance would be forthcoming.
With nerves jangling across Europe, German police arrested and then released seven people around Aachen, near the Belgian border, and later cancelled a Germany-Netherlands soccer match in Hanover, evacuating the stadium shortly before kick-off.
One of the targets on Friday was outside a Paris stadium where France was playing Germany in a friendly.
French prosecutors have identified five of the seven dead assailants from Friday - four Frenchmen and a fifth man who was fingerprinted in Greece among refugees last month.
A Syrian passport was found near his body, but a justice source said investigators doubted whether it was his, suggesting the attacker might have been using someone else's ID.
Police issued a photograph of the militant and asked the public for help in identifying him.
Despite a massive manhunt across Europe, police have failed to find Salah Abdeslam, 26, a Belgian-based Frenchman who is believed to have played a central role in both planning and executing the deadly mission.
Abdeslam drove back to Belgium from Paris early on Saturday with two friends, who have both been detained. A lawyer for one of the men told Belgian media that French police had pulled over their car three times early on Saturday as they headed to the border, but each time let them continue their journey.
The two men in detention deny any role in the attacks.