"Now we want to make sure that the Iranian nation can reap the benefits of the deal if it decides to remain in the accord as recommended by the remaining sides of the JCPOA", he said.
Iranian Foreign Minister Mohammad Javad Zarif who arrived in Chinese capital city of Beijing early on Sunday left China for Russian capital city of Moscow after holding a meeting with his city counterpart on the JCPOA.
"The European Union has made the most demands on Iran after United States withdrawal from the nuclear deal, urging us to stay committed to the worldwide agreement", he added.
However, President Trump has explicitly noted that U.S. hopes to reach a "fair" deal with Iran through new rounds of talks.
"The US withdrawal... is a violation of morals, the correct way to carry out politics and diplomacy and against worldwide regulations", he said during a meeting with visiting Sri Lanka President Maithripala Sirisena.
JCPOA was implemented in 2016 after five permanent members of UN Security Council, China, France, Russia, United Kingdom and US plus Germany reached an agreement with Rouhani's government to lift global sanctions imposed on the Islamic Republic in exchange for Tehran to curb its nuclear program.
The U.S. decision reignited the danger of economic crisis for Iran, which is now at the center of Tehran's diplomatic efforts.
Zarif made the remarks while speaking to reporters upon arrival at Beijing International Airport on Sunday morning.
Zarif arrived in China on Sunday at the top of a high-ranking political and economic delegation on the first leg of his diplomatic tour that follows USA decision to exit the landmark 2015 nuclear deal.
"Iran's interests in important areas and issues relevant to the JCPOA, like oil, gas, and petrochemicals sales, as well as banking relations should be clearly and explicitly defined and guaranteed", Rouhani said.
"China and Iran have comprehensive strategic partnership and are trade partners and these relations still continue", he noted.
Prior to leaving Iran, Zarif published a government statement via Twitter criticising Trump's "extremist administration" for abandoning "an accord recognised as a victory of diplomacy by the worldwide community".
It reiterated that Iran was preparing to resume "industrial scale" uranium enrichment "without any restrictions" unless Europe provided solid guarantees it could maintain trade ties despite renewed U.S. sanctions.
Trump hit back Saturday evening, tweeting that the accord had failed to contain Iran's militarism.
"Iran's Military Budget is up more than 40 percent since the Obama negotiated Nuclear Deal was reached. just another indicator that it was all a big lie", he wrote.
While announcing his decision, Trump called the agreement "defective at its core", claiming that after the lifiting of the sanctions Tehran "used its new funds to build nuclear-capable missiles, support terrorism and cause havoc throughout the Middle East and beyond".