A boy plays on the container of a Russian-Indian Brahmos cruise missile at the International Maritime Defence show in St. Petersburg, Russia.

Russia maybe have used cruise missiles to target Islamist militants’ stronghold in Syria on Tuesday and U.S.-led military coalition staged 23 air strikes against jihadists in Syria and Iraq.

A U.S. defense official said Russia is waging a significant number of strikes in Syria on Tuesday and told Washington ahead of the attacks it would use both sea-launched cruise missiles and long-range bombers.

Moscow gave the United States notice ahead of the strikes under an agreement with Washington on air safety protocols, the official said, adding at least some of the strikes targeted the Islamic State of Iraq and Syria (ISIS) stronghold of Raqqa.

The U.S. official, who spoke on condition of anonymity, stressed that the United States was not coordinating with Russia and the Russian strikes had not prompted the United States to call off any coalition activities.

Russia Tuesday also staged a “significant number” of air strikes on ISIS stronghold of Raqqa in Syria, the official said. The attacks may have included sea-launched cruise missiles and long range bombers, he added.

Meanwhile, the Combined Joint Task Force leading the operations said the U.S.-led military coalition on Monday staged 23 air strikes targeting ISIS in Syria and Iraq, including oil facilities used by the militant group,

In a statement released on Tuesday, the task force said six strikes near three Syrian cities hit several fighting positions as well as an Islamic State gas and oil separation point near Abu Kamal and three oil facilities near Dayr Az Zawr, the statement said.

In Iraq, 17 strikes in Iraq near six cities hit numerous targets including militants’ fighting positions, roads, tactical units and a headquarters in Sinjar.

Related articles across the web

• US State Department refutes reports of special envoy for fighting against IS resignation
• Syria launches rare strikes on ISIL-held Raqqa
• Readout of Secretary Carter's Call with Russian Minister of Defense Sergei Shoygu
• Merkel: Assad must be included in Syria peace talks
• Star Tory candidate denies fear mongering in B.C. flyer controversy
• Russia Has Added Dozens of Aircraft to Its Growing Military Presence in Syria: Reports
• Obama And Putin To Meet One-On-One Next Week In New York
• Bodies of Russia's last czar and wife exhumed
• With fight against the Islamic State in Iraq stalled, U.S. looks to Syria for gains
• Calgary man who joined ISIL charged with terrorism, 'utterance of threats towards Canada'