Before leaving Tehran for Ankara to participate in a trilateral summit on a Syrian settlement by the heads of states of the guarantors of the Astana process on Syria — Russia, Turkey and Iran — Rouhani called for an end to the unauthorized presence of foreign forces in Syria.
"From our viewpoint, the presence of foreign forces in war-stricken Syria without the authorization of the country's government is illegal and must be stopped," Rouhani said, Press TV reports.
"The issue of reconstructing Syria as well as drawing up and amending a new constitution are the key matters that are important for the future of Syria and they will be discussed during the trilateral meeting," Rouhani told reporters.
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He also accused certain countries of supporting terrorist groups operating in Syria with the aim of disintegrating the Levantine country.
"The Americans seek to prevent the Syrian government from taking control of all areas, and they even think about partitioning the country," the president said.
Since the beginning of the civil war in Syria, the US and its allies have supported the Syrian opposition, urging Syrian President Bashar al-Assad to step down as part of the crisis settlement. Airstrikes conducted by the US coalition in Syria are not authorized by the government of Assad or the United Nations Security Council.
The trilateral summit is scheduled for April 4. At a joint press conference with Turkish President Recep Tayyip Erdogan on the first day of talks in Ankara, Russian President Vladimir Putin said that opportunities to strengthen the ceasefire regime in Syria and inter-group dialogue have been investigated.
Putin also confirmed the determination of both Turkey and Russia to combat terrorism in Syria and to maintain the country's territorial integrity.