Rouhani and his oil and gas experts discussed investments in projects that total 4.7 billion euros.
With the tensions between Donald Trump and Rouhani, Khamenei still remains the leader of Iran.
Rouhani has said that Iran is extending a hand of friendship.
"How do we respond to what the Iranians plainly did?" Johnson told Sky News.
The Islamic nation currently holds the region's largest arsenal of ballistic missiles.
The country’s financial support for Palestinians and the Lebanese Shi‘ite group Hezbollah also angered Iranians, who want their government to focus on domestic economic problems instead.
Saudia Arabia denies supporting its citizens who hijacked planes on September 11, but modern critics wonder if the nation's growing extremism could lead to a repeat of the incident.
Hassan Rouhani’s re-election means that some of the nuclear deal’s loopholes could be filled.
For Iranians, the election presents a stark choice between competing visions of the country.