TEHRAN, Iran — Iran’s President Hassan Rouhani called Bashar Assad to reaffirm his support for the Syrian leader in the wake of a US missile strike, Rouhani’s office said on Sunday.

“The nation of Iran will remain alongside the Syrian nation in fighting terrorism and safeguarding Syria’s territorial integrity,” Rouhani said in the call on Saturday evening, according to a statement on the presidency website.

He said Western allegations that Assad’s regime was behind a chemical weapons attack last week were “baseless” and suggested it was carried out by rebel groups to influence global public opinion.

“Terrorists must not be allowed to use such weapons to accuse others and pave the way for actions that are contrary to international law,” said Rouhani.

Assad said the US missile strikes on a Syrian air base, launched in response to the chemical weapons attack, only made him more determined.

In this image provided by the US Navy, the guided-missile destroyer USS Porter (DDG 78) launches a tomahawk land attack missile in the Mediterranean Sea, Friday, April 7, 2017.(Mass Communication Specialist 3rd Class Ford Williams/U.S. Navy via AP)

In this image provided by the US Navy, the guided-missile destroyer USS Porter (DDG 78) launches a Tomahawk land attack missile in the Mediterranean Sea, Friday, April 7, 2017.(Mass Communication Specialist 3rd Class Ford Williams/U.S. Navy via AP)

“The United States failed to achieve its goal with this aggression, which was to raise the morale of the terrorist groups it supports after the victories achieved by the Syrian army,” Assad told Rouhani, according to Syrian state news agency SANA.

“The Syrian people and army are determined to crush terrorism in every part of Syrian territory.”

Iran and Russia have been the key backers of Assad and refer to all Syrian opposition groups as “terrorists.”

File: Syrian President Bashar Assad listening to a question during an interview with AFP in the capital Damascus, February 11, 2016. (AFP/JOSEPH EID)

File: Syrian President Bashar Assad listening to a question during an interview with AFP in the capital Damascus, February 11, 2016. (AFP/JOSEPH EID)

“Greater coordination between Iran, Syria and Russia can be very effective in the fight against terrorism. Those who think that by supporting terrorists, they can change Syria’s future in their interest, are absolutely wrong,” Rouhani said.