We need to be able to demonstrate that what we do in today's world, in humanitarian aid, the enormous effort to minimize the tragic situations that we see all over the world, I think, without the U.N., people would suffer much more, and the situation would be much more terrible.

Syria has become the great tragedy of this century - a disgraceful humanitarian calamity with suffering and displacement unparalleled in recent history.

What I think it's important to recognize in today's world is that all of our societies are multiethnic, multi-religious and multicultural. And that is a positive thing. That's a richness, and also strength. But we also have to recognize that, for those societies to be harmonious, there is a lot of the investment that needs to be made in social cohesion and inclusivity. But the important thing to recognize, and particularly Europe, most of the terrorist attacks are not done by people that came from the outside. They are homegrown.

The international community has to overcome its differences and find solutions to the conflicts of today in South Sudan, Syria, Central African Republic and elsewhere. Non-traditional donors need to step up alongside traditional donors. As many people are forcibly displaced today as the entire populations of medium-to-large countries such as Colombia or Spain, South Africa or South Korea.

We can't deter people fleeing for their lives. They will come. The choice we have is how well we manage their arrival, and how humanely.

Thus, on this World Refugee Day, let us take time to recognize and draw inspiration from these ordinary people who have shown such extraordinary courage - the world's millions of refugees and displaced.

I think that it's very important to have the United States' engagement in many situations we have around the world, be it in Syria, be it in the African context. The United States represents an important set of values, human rights, values related to freedom, to democracy. And so the foreign policy engagement of the United States is a very important guarantee that those values can be properly pursued.