The three parties will "exchange views on Iran's nuclear energy and other matters of common interest", says a spokesperson for the Chinese Foreign Ministry.
The authoritarian China has previously hinted that it is interested in mediating in the complex issue.
The international community has long been afraid that Iran will develop nuclear weapons. In 2015, the nuclear energy agreement JCPOA was signed by Iran and the five permanent members of the UN Security Council (France, China, the United Kingdom, Russia, and the USA) as well as Germany, aiming to prevent Iran from developing nuclear weapons.
JCPOA provided, among other things, insight into the country's atomic energy program, while it was heavily restricted, in exchange for the lifting of international sanctions.
During his first term in 2018, however, US President Donald Trump unilaterally withdrew his country from the agreement and re-imposed sanctions. Since then, the agreement has been more or less punctured.
Iran has significantly increased its stockpile of highly enriched uranium recently. A report from the UN's atomic energy agency IAEA showed in February that Iran has nearly 275 kilos of uranium enriched up to 60 percent, which is a short step from the 90-percent level required to manufacture nuclear weapons.
