"China has always believed that imposing sanctions on any occasion, or threats to impose them, cannot resolve disputes. Only dialogue and negotiations can solve the problem," Lu said.
He also stressed that Beijing had always opposed unilateral sanctions and extraterritorial jurisdiction.
In May, US President Donald Trump announced that his country would exit the JCPOA, which stipulates the gradual lifting of the anti-Iran sanctions in exchange for Tehran maintaining the peaceful nature of its nuclear program. In addition, Trump decided to reinstate economic restrictions against Iran and also secondary sanctions.
After the US withdrawal, other parties to the agreement — China, France, Germany, Iran, Russia, the United Kingdom, and the European Union — have expressed their commitment to the accord.