A Russian delegation led by Rosatom Deputy Head Nikolai Spassky met with Iranian Nuclear Chief Mohammad Eslami in Tehran to discuss nuclear cooperation, Iranian state media reported on Wednesday.

The meeting followed Eslami’s trip to Moscow last week, where Iran and Russia signed agreements on small reactors and a $25 billion project for four large nuclear power units in Hormozgan province.

The talks also covered small modular reactors and 1,250 megawatt power units, the report said.

The two sides reviewed current projects and stressed the need to speed up joint work, Iranian officials said. They also agreed Rosatom Director Alexey Likhachev would visit Iran soon to inspect progress on units two and three of the Bushehr nuclear plant.

The discussions came as a new strategic partnership treaty between Iran and Russia entered into force after approval by Russia’s lower house of parliament. The agreement covers wide cooperation in areas including nuclear energy.

The nuclear meetings followed reports this week that Iran has a €6 billion agreement with Russia for 48 Su-35 fighter jets, with deliveries expected between 2026 and 2028. Iranian lawmakers have said Moscow has already sent MiG-29 aircraft and that more advanced systems such as Su-35s and S-400 air defenses will follow.