World leaders raised the alarm over an "acute and growing flow of foreign terrorist fighters" in a draft statement drawn up today after the Paris assaults that killed 129 people.
Heads of the Group of 20 top world economies said they would share intelligence, track border crossings and boost aviation security, according to a draft statement obtained by AFP during a summit in the Turkish Mediterranean resort of Antalya.
The leaders observed a minute’s silence earlier today to remember the victims of terror attacks in Paris and Ankara at the start of the two-day G20 summit.
"I am inviting you all to hold a minute of silence for those who lost their lives in terrorist attacks including in particular in Ankara and Paris," Turkish President Recep Tayyip Erdogan said, referring to the October suicide bombings in Ankara that killed 102 and the Paris attacks on Friday that claimed 129 lives.
World leaders gathered in the town of Belek, in Turkey's coastal province of Antalya for the G20 summit that has taken on new urgency after attacks in Paris pushed the fight against the so-called Islamic State militants to the top of the agenda.
US President Barack Obama has vowed to step up efforts to eliminate IS in Syria and to prevent it from carrying out attacks like those in Paris, while European leaders have urged Russia to focus its military efforts on the radical Islamists.
The two-day summit brings the leaders just 500km from Syria, where a four-and-a-half year conflict has transformed IS into a global security threat and spawned Europe's largest migration flows since World War Two.
Europe and America now face the question of how the West should respond after IS again demonstrated that it posed a threat far beyond its strongholds in Syria and Iraq.
Washington already expects France to retaliate by taking on a larger role in the US-led coalition's bombing campaign against IS.
Russia joined the conflict a month and a half ago with air strikes in Syria, but has been targeting mainly areas controlled by the moderate Syrian opposition fighting its ally Bashar al-Assad, rather than IS, critics have said.
Turkey and Western allies, by contrast, want Mr Assad out.
Mr Obama and Russia's Vladimir Putin have no formal bilateral meetings planned during the summit.
However, as the leaders moved into place for a group photo Mr Putin approached Mr Obama and they shook hands, exchanging words for a few moments.
The two leaders were later seen holding informal talks on the sidelines of the summit, but it was not immediately clear how long the two leaders spoke for, or what they discussed.
The summit follows not only the Paris attacks but also comes two weeks after a suspected bomb attack on a Russian airliner killed 224 people in the Sinai Peninsula.
It also comes just over a month after two suspected IS suicide bombers blew themselves up in Ankara, killing more than 100 people in Turkey's worst such attack.
