The Turkish National Defense Ministry reported on Tuesday that the bolstering of security in Syria was discussed during the quadrilateral conference between Turkey, Russia, Iran, and the Syrian regime in Moscow.

The discussion on Syria covered the specific actions that may be implemented to improve relations between Turkey and Syria, according to a statement from the ministry.

The statement came after Turkish National Defense Minister Hulusi Akar and National Intelligence Organization (MIT) head Hakan Fidan attended a meeting with his counterparts in Russia’s capital.

“Quadrilateral meeting on Syria discussed fight against terrorist organizations and all extremist groups on Syrian territory,” it added.

Turkish, Russian, Iranian, and Syrian defense and intelligence chiefs also discussed stepping up efforts to return Syrian refugees to their country, the ministry said.

The parties also reiterated their respect for the Syria’s territorial integrity.

“As a result of the meeting, which was held in a constructive atmosphere, the importance of the continuation of the meetings in the quadrilateral format was emphasized to ensure and maintain stability in Syria and the region as a whole,” the statement read.

Last December, defense ministers and intelligence chiefs of Turkey, Russia, and the Syrian regime met in Moscow and agreed to continue tripartite meetings to ensure stability in Syria and the wider region.

Iran was also included in the talks, with Turkey previously saying that Ankara would be “pleased if Iran is involved in this process.”

Earlier this month, Turkish Foreign Minister Mevlut Cavusoglu signaled that a meeting between the foreign ministers of Turkey, Russia, Iran, and the Syrian regime is likely to be held in early May in Moscow.

Although no date or location has yet been announced, the foreign ministers’ meeting would continue restarting high-level talks between Turkey and its neighbor Syria since the civil war in the country began in 2011.