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

It is, for me, clear that the world needs a United States that is engaged in security issues, in development issues, in human rights issues. The contribution of the United States for global affairs is absolutely crucial. And the cooperation with the U.N. is very important from our perspective.

Now, it's high time for all those that have an influence on the parties with the conflict to understand that it is in the interest of everybody to put an end to this conflict. But this kind of persuasion, this kind of intense pressure, I believe it's my duty to do, even if I recognize that the contradictions and the different perceptions of interest that exist are making it very difficult.

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.

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.

While every refugee's story is different and their anguish personal, they all share a common thread of uncommon courage - the courage not only to survive, but to persevere and rebuild their shattered lives.

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.