"New Zealand is a nation of travellers, and our country has close and important relations with countries in the Middle East, in Europe and closer to home in the Asia Pacific region - where terrorist groups are operating.
"New Zealand must play a role, along with others here today, in standing up to the brutality and extremism of ISIL," Mr Key said.
Over 25 world leaders attended the summit with Ministers and representatives from over 30 other countries.
"In the lead up to ANZAC Day 2015 and the centenary of the Gallipoli commemorations two days from now, it is timely to reflect on current challenges to international peace and security," he said.
"The need for a strong UN Security Council and a focus on conflict prevention has never been greater."
The Prime Minister also met with the President, Prime Minister and Foreign Minister of Turkey, the President of Iraq, and the Emir of Qatar during the Summit.