“That is why the UK is now going to increase further our security support and we will be calling on others to do the same.”
Turning to migration, she told the summit: “Countries have to be able to exercise control over their borders.
“Failure to do so erodes public confidence, fuels international crime, damages economies and reduces resources for those who genuinely need protection and whose rights under the Refugee Convention should be fulfilled.”
She added: “We need a better approach to managing economic migration. One which recognises all countries have a right to control their borders.
“And we must commit to accepting the return of our nationals who have no right to remain elsewhere.
“By ensuring a managed and controlled international migration response we can achieve better outcomes for all of our citizens – especially those who are the most vulnerable.”