United Nations Security Council backing for more concerted international action against the Islamic State (IS) was hailed as an "important moment" by Prime Minister David Cameron as he seeks to bolster support for UK air strikes in Syria.
A French-drafted resolution urging countries to "combat by all means this unprecedented threat" garnered universal approval tonight in the wake of the Paris atrocities.
The text was backed by Russia - the threat of whose veto has led Western nations to hold back from seeking UN backing until the scenario-changing bombing of a Russian airliner and last Friday's massacre on the streets of the French capital which killed 129 people.
Mr Cameron said the vote "shows beyond doubt the breadth of international support for doing more in Syria and for decisive action to eradicate" IS - also referred to as Isil and Isis.
The resolution fell short of providing a legal basis for military action and did not invoke the chapter of the UN charter authorising the use of force.
But the Prime Minister - who insists the legal case is solid even without it - will hope it will help persuade Labour MPs to approve an escalation of the UK's military involvement in the face of staunch opposition from Jeremy Corbyn.
The Labour leader will use a speech tomorrow to underline his position, declaring that being "at the centre of a succession of disastrous wars" had undermined British security.
Mr Cameron - who is preparing to publish his case for UK forces joining air strikes - said: "Today, the world has united against Isil.
"The international community has come together and has resolved to defeat this evil, which threatens people of every country and every religion.
"The United Nations Security Council has unanimously backed action against this evil death cult in both Syria and Iraq. It has also reiterated its determination to secure a political solution to the conflict in Syria.
"Britain will continue to support our allies who are fighting Isil in Syria. I will continue to make the case for us to do more and to build support in Parliament for the action that I believe is necessary for Britain to take to protect our own security, as part of a determined international strategy.
"We cannot expect others to shoulder the burdens and the risks of protecting this country."