US President Donald Trump opened the UN Security Council meeting on non-proliferation of weapons of mass destruction, where he is expected to voice fresh criticism of Iran.

IranPress/America: Facing determined opposition from allies over US efforts to isolate Iran, Donald Trump said  on Wednesday that his administration will soon go beyond previous sanctions regimes by imposing the "toughest" financial penalties ever designed.

US president once again criticized a nuclear deal with Iran endorsed by the security council three years ago as a "horrible, one-sided deal" and asked international partners to pressure Iran to end its missile work.

Trump also used his address to the 73rd session of the General Assembly on Tuesday to attack Iran, and promised hard-hitting sanctions against Tehran while urging the world to isolate the Islamic Republic.

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The US initially said the council meeting chaired by Trump would focus on Iran, but later broadened the agenda to include nuclear non-proliferation and weapons of mass destruction.

It is Trump’s first experience in leading a session of the UNSC, where the US currently holds the rotating presidency. It is only the third time a US leader is presiding over the body.

US allies around the table, represented primarily by the UK’s prime minister, Theresa May and the French president, Emmanuel Macron, side with Russia and China in their opposition to Trump’s withdrawal from the 2015 nuclear deal with Iran, and are uneasy about US sabre-rattling towards Tehran.

French President Emmanuel Macron on Wednesday told the UN Security Council meeting on non-proliferation that US Iran's policy should not be sanctions and containment.

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Addressing world leaders at the 73rd UN general assembly meeting on Tuesday, Iranian President Hassan Rouhani responded to Trump’s anti-Iran remarks.

He accused the current US administration of violating the rules of international law by withdrawing from the 2015 nuclear deal that Iran signed with six world powers, including the US.

He also emphasized that the US is pushing other countries to violate the Iran deal, known as the Joint Comprehensive Plan of Action (JCPOA), and that it is threatening all countries and international organizations with punishment if they comply with Security Council Resolution 2231, which endorsed the JCPOA.

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Tensions have ramped up between Tehran and Washington after the American president in May fulfilled his election campaign promise and pulled his country from the 2015 multilateral nuclear deal with Iran, officially known as the Joint Comprehensive Plan of Action (JCPOA).

Since its withdrawal from the JCPOA, Washington has sought to build up international pressure on Iran. 

Furthermore, the US administration introduced punitive measures — known as secondary sanctions — against third countries doing business with Iran.

first round of American sanctions took effect in August, targeting Iran's access to the US dollar, metals trading, coal, industrial software, and auto sector. A second round, due on 4 November, will be targeting Iran’s oil sales and its Central Bank.

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