A meeting between representatives of Russia, China, Germany, France, Britain and Iran on the Joint Comprehensive Plan of Action (JCPOA) in Vienna, Austria on May 19. (Photo: Xinhua/VNA)

On Monday, the International Atomic Energy Agency (IAEA) and Iran agreed to extend by one month the 3-month agreement allowing monitoring of Tehran's nuclear activities which expired on May 22.

Russian delegate Mikhail Ulyanov said a resolution is in sight and this is probably the final round of talks. Iranian government spokesman Ali Rabiei said he is optimistic about reaching an agreement soon.