A top Iranian official has said that Iran and Russia need to prevent the U.S. from interfering in the internal affairs of Syria though enhanced coordination.

Secretary of Iran’s Supreme National Security Council (SNSC) Ali Shamkhani said on Tuesday in a telephone conversation with his Russian counterpart Nikolai Patrushev that Tehran and Moscow should expand cooperation to help resolve the Arab country’s crisis.

The two sides discussed the latest development in Syria and the upcoming Syrian peace talks in the Kazakh capital of Astana.

Shamkhani described Washington’s actions in Syria as “adventurous moves” and called for cooperation to prevent further U.S. intervention in the war-torn country.

“Boosting coordination between Iran and Russia to prevent the U.S. from interfering in Syria illegally and undermining the country’s territorial integrity and sovereignty is an inevitable necessity in the course of Tehran-Moscow cooperation,” he remarked.

Iran, Russia and Turkey has brokered negotiations between the Syrian government and its opposition groups. The negotiations, which are held in Astana, led to a deal to establish safe zones in Syria in the previous round in May.

The fifth round of the talks, which are aimed at securing a lasting ceasefire in the Arab country, will conclude on Wednesday.