Hassan Rouhani
Hassan RouhaniReuters

European Union High Representative for Foreign Affairs Federica Mogherini participated in the swearing-in ceremony of Iranian President Hassan Rouhani.

This will be 68-year-old Rouhani's second term as president.

According to Bloomberg, Mogherini's presence expressed the EU's clear and public support for Rouhani's leadership.

In his speech to Iran's parliament, Rouhani said his country will not be the first to violate the nuclear deal, but will also not stand by the deal if other countries violate it.

Iranian officials said the US' new sanctions on the Iranian Republic, and US President Donald Trump's desire to limit international trade with Iran, are in violation of the deal, which was signed in 2015 by representatives of 6 countries.

In a pre-ceremony meeting with Mogherini, Iranian Foreign Minister Mohammad Javad Zarif Khonsari said the EU must remain alert to Trump's efforts to "undermine the deal and blame Iran." In her response, Mogherini promised that the EU would "determinedly" keep the Iran deal, Iran's state-run news agency reported.

The 2015 deal was signed by Iran, Britain, China France, Germany, Russia, and the United States. It attempts to limit Iran's nuclear development, and lifted sanctions on the rogue nuclear power-to-be.