France mourned the 130 people killed in the November 13 Paris attacks, with President Francois Hollande set to lead a solemn ceremony in honour of the victims.
Prince Charles warned that if international leaders fail to clinch a deal on climate change at talks in Paris next week, it would leave mankind facing a "perfect storm".
French President Francois Hollande will hold talks with Russian leader Vladimir Putin, as part of his diplomatic marathon to forge a broader coalition against Islamic State jihadists in the wake of the Paris attacks.
Sanctions against Russia over its involvement in the Ukraine crisis could be lifted if Moscow fulfils commitments it made to help resolve the conflict, French Prime Minister Manuel Valls said.
French Prime Minister Manuel Valls on Tuesday urged the European Union to limit the number of migrants it allows into the bloc.
France's leading Muslim body said it would create a permit to preach for imams in a bid to root out extremists, as well as a new religious body to fight back against jihadist propaganda.
German Foreign Minister Frank-Walter Steinmeier said in an interview published he thought the first explosion he heard a week ago at a Paris stadium was fireworks, but soon realised it was a terror attack.
Brussels will remain at the highest possible alert level on Monday with schools and metros closed over a "serious and imminent" security threat similar to the Paris attacks.
Benjamin Clementine, the experimental singer and poet with deep roots in Paris, won Britain's Mercury Prize and dedicated the award to the attack-stricken city.
The European Union agreed to rush through reforms to the passport-free Schengen zone by the end of the year amid growing concerns about border security in the wake of the Paris attacks.
Sweden has been naive about the risk of an attack on its soil and plans to beef up security measures, including surveillance of encrypted communications.
Some of the suspects in the Paris attacks took advantage of Europe's migrant crisis to "slip in" unnoticed, warning the EU needed to "take responsibility" over border controls.
France revealed it will spend an extra 600 million euros ($641 million) next year to ramp up security after the Paris attacks.
Israeli Prime Minister Benjamin Netanyahu called for "a global solution" to terrorism in a phone call with Francois Hollande on Wednesday to express his solidarity after the Paris attacks.
US President Barack Obama said he was optimistic an elusive deal to contain global warming could be forged at an upcoming crunch summit in Paris.
Spain backed France's decision to let EU deficit obligations slide in order to step up spending on security in the wake of the Paris terror attacks.
President Vladimir Putin ordered the Russian navy in the Mediterranean to establish contact with its French counterparts and work together "as allies" in a campaign against the Islamic State group in Syria.
A Facebook tool that let people check whether friends were safe after deadly attacks in Paris will be used more widely in the future, the social network said.
Britain should "think again" about taking part in air strikes on Islamic Statejihadists in Syria, Defence Secretary Michael Fallon said, after attacks in Paris that left at least 129 people dead.
Israel criticised "appallingly impudent" remarks by Sweden's foreign minister for drawing a parallel between the Paris attacks and the Palestinian-Israeli conflict.
- Great Britain
- Schengen zone
- Mediterranean Sea