Russia will return a second batch of 20 percent-enriched uranium to Iran, according to the newspaper Tehran Times.

"We will receive a second batch of 20 percent-enriched uranium, which has been kept in Russia under the 2015 nuclear deal and now will be used at the Tehran nuclear reactor," said Behrouz Kamalvandi, spokesman and vice-president of Iran's Atomic Energy Organization, as quoted by Tehran Times on Aug. 12.

Under the Iran nuclear deal, also known as the Joint Comprehensive Plan of Action (JCPOA), the United Nations, the United States and the European Union lifted sanctions against Iran in response to the country's promise that it will limit its uranium enrichment activities and transfer all 20 percent-enriched uranium, which can start a nuclear reaction, and fuels suitable for producing nuclear weapons to Russia. 

In May, Trump announced that the US will withdraw from the 2015 Iran nuclear deal and re-impose sanctions on Iran.

So far, the other signatories to the deal – Iran, China, Russia, France, UK, Germany and the European Union in general – have agreed that the deal needs to be preserved.

"If the nuclear deal remains alive, the other sides should sell us the fuel and if the nuclear deal dies, then we would feel unimpeded to produce the 20 percent-fuel ourselves," Kamalvandi said, as quoted by Sputnik.

Iran received the first batch nearly seven months ago, and any of these batches can be used for nearly one year, according to Sputnik.