Thirty countries have pledged to help Iraq fight Islamic State (IS) militants "by all means necessary".
A joint statement by foreign ministers taking part in a major conference in Paris talks said support would include "appropriate military assistance".
The talks had been called to agree a strategy to combat the group, which controls large parts of Iraq and Syria.
The conference followed a whirlwind tour of the Middle East by US Secretary of State John Kerry. Kerry, who attended the summit, has been drumming up support for a plan of action unveiled by President Barack Obama last week.
Opening the summit, French President Francois Hollande said the threat posed by IS militants needed a global response, the BBC said.
Iraqi President Fuad Masum, who co-hosted the conference with Hollande, said the international community must pursue the militants "quickly".
"If this intervention and support to Iraq is late, that means that Islamic State could occupy more territory and the threat it poses will be even bigger," he said.
The summit closed a few hours later with a joint statement saying the participants were "committed to supporting the new Iraqi government in its fight... by any means necessary, including appropriate military assistance".
