Russia described the attack as an aggression against a sovereign state.

Following the US military action, Russia decided to suspend its memorandum of understanding on air safety over Syria with the United States, according to the Russian Foreign Ministry.

"It is evident that the US cruise missile strikes against a Syrian airbase have been prepared long before today’s events. A large system of measures of reconnaissance, planning, preparation of flight tasks and bringing the missiles to launch readiness needs to be carried out to prepare such an attack," ministry's spokesman Maj. Gen. Igor Konashenkov said.

According to Konashenkov, the Idlib chemical attack "served only as a formal pretext, while the demonstration of military force took place exclusively due to internal political reasons. "

A warplane which activists say belongs to the Russian forces flies in the sky over the southern countryside of Idlib, Syria October 2, 2015
© REUTERS/ Khalil Ashawi
Russia Suspends Memorandum With US on Flight Safety in Syria - Foreign Ministry
The Russian Defense Ministry considers the US attack on a Syrian airfield in the Homs province a gross violation of a memorandum on the safety of flights over Syria. Thus, Russia has suspended the cooperation with the US aimed to avoid incidents in Syrian airspace.

"We assess such actions of the US side as a gross violations of the memorandum on incident prevention and ensuring security in operations in the Syrian airspace signed in 2015. The Russian Defense Ministry is suspending cooperation with the Pentagon within the framework of this memorandum," Maj. Gen. Igor Konashenkov said.

In this image from video provided by the U.S. Navy, the guided-missile destroyer USS Porter (DDG 78) launches a tomahawk land attack missile in the Mediterranean Sea, Friday, April 7, 2017.

© AP Photo/ Ford Williams/U.S. Navy
Digging Up the Hatchet: Pentagon's Massive Airstrike in Syria 'Resembles Yugoslavia, Iraq, Libya'
The Russian Defense Ministry said the US administrations come and go, while its policies remain the same since the bombings of Yugoslavia, wars in Iraq and Libya.

"The administrations of the United States are changing, but the methods of unleashing wars have remained the same since Yugoslavia, Iraq and Libya. And again, the pretext of aggression is not an objective investigation, but allegations, fact manipulation, showing photos and pseudo-vials at international organizations," Konashenkov said.

Only 23 missiles from US destroyers reached the targeted Syrian airfield, it is unclear where the other 36 landed, the ministry said.

"On April 7, at the time between 3:42 and 3:56 a.m. Moscow time [00:42-00:56 GMT] a massive missile attack by 59 Tomahawk cruise missiles was carried out from two destroyers of the US Navy [Ross and Porter], from the Mediterranean Sea, near the island of Crete, targeting Syrian airfield Ash Sha'irat [Homs Province]. According to the Russian data recording technology, only 23 cruise missiles reached the Syrian airbase. It is not clear where the other 36 cruise missiles landed," Konashenkov said at a briefing.