Much of the worldwide community accused Assad's government of carrying out Tuesday's suspected chemical attack on Khan Sheikhun, but Damascus denied responsibility.
The statement says King Salman bin Abd al-Aziz al-Saud agreed it "was a necessary response" to the chemical weapons attack by Bashar Assad's government, which killed dozens of civilians in rebel-led northern Idlib.
According to reports, 89 people, including 33 children and 18 women, died in a suspected nerve agent attack in the Syrian rebel-held town of Khan Sheikhoun earlier this week.
Russian Prime Minister Dmitry Medvedev charged that the USA strikes were one step away from clashing with Russia's military.
The United States earlier on Thursday night launched 59 Tomahawk cruise missiles at the military airfield in Ash Sha'irat.
Turkey, a key backer of the Syrian opposition, has thrown its weight behind a stuttering peace process in the Kazakh capital, Astana, which it hopes will pave a way for a political solution to Syria's devastating war.
"We hope that Russian Federation gets involved as well - that at least they stop defending [Bashar al-] Assad", Erdogan said.
Donald Trump spoke by telephone with Saudi Arabia's King Salman about the strikes, the Saudi Press Agency said on Saturday.
The Russian president, for his part, condemned the United States strikes against Syria as an unacceptable move and a bid to support terrorists.
Mourinho: Manchester United in trouble after Ibrahimovic and Rojo injuries
I imagine the players are more exhausted than me. "He is a strong man". "But he has the experience and character, so he has to". United are fifth in the Premier League, four points adrift of rivals Manchester City with seven matches remaining.
He said the best outcome would be a peace agreement that leads to a transitional government accepted by all Syrians, followed by elections in which all Syrians, including those living overseas, could vote for new leadership.
'The question is how do you remove Assad and what does the next day look like?'
Syrian Deputy UN Ambassador Mounzer Mounzer denied the country's use of chemical weapons, stating at the UN session that Syria "would never use such weapons in any of its operations against armed terrorist groups".
Sir Michael said the attack had happened "on their watch" and that Vladimir Putin must now live up to previously made promises that Mr Assad's chemical weapons have been destroyed.
But there have been repeated allegations of chemical weapons use since.
Later this week US Secretary of State Rex Tillerson will travel to Moscow, while Foreign Secretary Boris Johnson will garner support at a G7 summit of foreign ministers. Tillerson is expected in Moscow for talks with Russian officials next week.
In Damascus, dozens of Syrian students gathered outside the offices of the United Nations to protest against the USA missile attack. Reluctant to put significant troops on the ground in Syria, the US for years has struggled to prevent Assad from strengthening his hold on power.
The discussions are linked to the situation in Syria, she said. The Observatory said 15 people, including four children, were killed in the airstrike.
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