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The United States is meeting our responsibilities by pursuing an agreement with Russia to reduce our strategic warheads and launchers. And just as we meet our responsibilities, so must other nations, including Iran and North Korea.

Earlier this year, we imposed tough, new, sanctions on North Korea to stop their efforts to develop weapons of mass destruction. And we will continue to stand with our allies and partners to press North Korea to move in a new direction.

This week, we joined with the United Kingdom and France in presenting evidence that Iran has been building a secret nuclear facility to enrich uranium. This is a serious challenge to the global nonproliferation regime, and continues a disturbing pattern of Iranian evasion. That is why international negotiations with Iran scheduled for October 1st now take on added urgency.

My offer of a serious, meaningful dialogue to resolve this issue remains open. But Iran must now cooperate fully with the International Atomic Energy Agency, and take action to demonstrate its peaceful intentions.

On this, the international community is more united than ever before. Yesterday, I stood shoulder-to-shoulder with our European allies in condemning Iran's program. In our meetings and public statements, President Medvedev of Russia and I agreed that Iran must pursue a new course or face consequences. All of the permanent members of the United Nations Security Council, and Germany, have made it clear that Iran must fulfill its responsibilities.

Iran's leaders must now choose - they can live up to their responsibilities and achieve integration with the community of nations. Or they will face increased pressure and isolation, and deny opportunity to their own people.

These are the urgent threats of our time. And the United States is committed to a new chapter of international cooperation to meet them. This new chapter will not be written in one week or even one year. But we have begun. And for the American people and the people of the world, it will mean greater security and prosperity for years to come.