G20 leaders have promised to cooperate over border security, airline safety, sharing intelligence on suspected terrorists and freezing their assets.
The closing statement from the summit stressed that terrorism should not be associated with a specific religion, nationality or ethnicity.
US President Barack Obama says he is committed to a joint strategy to annihilate Islamic State, but will not authorise US ground troops.
“ISIL is the face of evil. There have been a few who suggested that we should put large numbers of US troops on the ground. And it is not just my view, but the view of my closest military and civilian advisers that that would be a mistake.”
Russian leader Vladimir Putin says cutting off funding for groups like IS is the key.
“Channels of finance for terrorist activity must be cut off. I’ve given examples based on information we have on IS financing by individuals from various countries. This financing, as we found out, comes from 40 countries, including some in the G20.”
ISIL: Washington and Rome are next
Undeterred, the so-called Islamic State has warned that countries taking part in air strikes against Syria face the same fate as France.
Posted on the usual site used by the group, it is claimed the video is by militants in the Iraqi province of Salahuddine, north of Baghdad.