From their joint command center, Russia and Iran released a statement that said that they will respond to additional U.S. military actions after the missile strike in Syria Thursday.

“What America waged in an aggression on Syria is a crossing of red lines. From now on we will respond with force to any aggressor or any breach of red lines from whoever it is and America knows our ability to respond well,” the statement warned.

Russian fighter aircraft in Syria

Before the statement’s release, Iranian President Hassan Rouhani denounced the “flagrant US aggression on Syria”. The Islamic Republic’s leader, a major ally of Syrian President Bashar al-Assad, yesterday urged for an independent analysis into the chemical attack on an Syrian town that left 70 people dead, including small children.

Iranian state television reports that Rouhani warned that the U.S. missile strike may cause an increase in extremism in the region.

In a phone conversation, The Iranian leader reportedly told al-Assad that, “Allegations that Syria launched the chemical attack were just a pretext to disrupt the Syrian peace process”.

He expressed his thanks in behalf of “the Syrian nation,” for the Islamic Republic’s support.

The Syrian president said Syria’s citizens and armed forces were “determined to crush terrorism in every part of Syrian territory”, apparently referring to the rebel groups fighting his regime for the past several years.

President Rouhani also condemned the U.S.-allied Gulf Arab states for supporting the American attack.

“Unfortunately, there are countries in our own region which encourage America’s acts of aggression. Your turn will come too,” he threatened.

The Kingdom of Saudi Arabia praised the military action and described it as a “courageous decision” by U.S. President Trump’s administration. The United Arab emirates also announced their support for the strike.