We begin in New York, where the annual meeting of the UN General Assembly is officially underway -- with 133 world leaders in attendance. Tuesday's session saw the US and Iran exchange threats, yet again. Iranian President Hassan Rouhani blasted US sanctions against his country as "economic terrorism", while US President Donald Trump derided Tehran as a "corrupt dictatorship". CGTN's Nathan King has more details from the United Nations.

This year's harshest rhetoric from Washington was leveled at Iran. Tehran is complying with the nuclear deal, but the U.S. president called it the worst deal ever, withdrew the U.S. from it, and has now asked UN members to help pile on the pressure.

DONALD TRUMP US PRESIDENT "We ask all nations to isolate Iran's regime as long as its aggression continues. And we ask all nations to support Iran's people as they struggle to reclaim their religious and righteous destiny."

Not long after, Iran's President Hassan Rouhani took the podium and promised Iran would try and stay in the deal, despite US sanctions.

HASSAN ROUHANI IRANIAN PRESIDENT "Unlawful, unilateral sanctions in themselves constitute a form of economic terrorism and a breach of the right to development. The economic war that the United States has initiated under the rubric of new sanctions not only targets the Iranian people but also entails harmful repercussions for the people of other countries."

China, Russia and European nations and have vowed to honor the Iran nuclear deal. The EU announcing in New York this week that it will set up a special mechanism to allow European nations to trade with Iran.

NATHAN KING NEW YORK "When it comes to dealing with the issues of nuclear proliferation, Washington seems willing to charm Pyongyang which has nuclear weapons, but is isolating Iran, which doesn't. As the foreign policies of many nations gathered here indicate. The world is not going along with Washington thinking. Nathan King, CGTN At the United Nations."