The White House said that Saudi King Salman and US president Barack Obama decided to raise support for “the Syrian moderate opposition” over the phone on Tuesday.
The two men affirmed during the conversation the necessity to cooperate in fighting DAESH.
In a statement, the White House said that the phone call also focussed on a welcomed second round of United Nations talks between the parties of Yemen’s war.
"The two leaders pledged to remain in close contact on these and related issues, and reaffirmed the strong and enduring strategic partnership between the United States and Saudi Arabia," it said.
Saudi Arabia is a member of a US-led coalition that has launched an air campaign in Syria in Sept. 2014, targeting mostly DAESH bastions.
On Sept. 30, Russia began its bombing campaign in Syria on the side of the Assad regime, targeting mostly Syrian opposition-held territories in the country, rather than DAESH- the move has been strongly protested by Turkey, US, and the NATO alliance.
US Secretary of State, John Kerry and King Salman met in Saudi Arabia on Saturday to continue the talks regarding the peace process in Syria.
Both Kerry and the Saudi king reiterated their desire for a peace process in Syria without the existence of Syrian regime leader, Bashar al Assad, who said that he is ready for fresh elections.
On Friday, the foreign ministers of the US, Saudi Arabia, Russia and Turkey met in Vienna to discuss the situation in Syria and to define strategies to support the so-called "political transition.”
Later on Saturday, US Secretary of State, John Kerry and King Salman met at Diriyah farm outside the Saudi capital of Riyadh, to continue the talks regarding the peace process in Syria.
Both Kerry and the Saudi king reiterated their desire for a peace process in Syria without the existence of Syrian regime leader, Bashar al Assad, who said he is ready for fresh elections.
More than 250,000 people have been killed in Syria since the civil war started between the Assad regime and opposition forces following the Arab Spring movement that swept a number of countries in the Middle East and North Africa.
In addition, 6.7 million people have been displaced internally, while at least 5 million have fled the country to the neighbouring countries of Turkey, Lebanon, Egypt and Jordan.