The country's defense ministry said it was verifying reports that Abu Bakr al-Baghdadi was killed on the southern outskirts of Syria’s Raqqa on May 28 along with other several senior commanders from the extremist group. Russia said Friday it was verifying whether it had killed the leader of the Islamic State of Iraq and the Levant in an airstrike targeting a meeting of ISIL leaders just outside the group’s de facto capital in Syria, dealing a potentially severe blow to the extremist group as it fights to hang on to its strongholds in Syria and Iraq. The Russian Defence Ministry claimed that Abu Bakr al-Baghdadi was killed in a Russian strike in late May along with other senior group commanders, adding that the information about his death was still “being verified through various channels.”

Asked later about that claim at a news conference in Moscow, however, Russian Foreign Minister Sergey Lavrov said: “I don’t have a 100-per cent confirmation of the information.”

There had been previous reports of al-Baghdadi being killed but they did not turn out to be true. "As a result of the Su-35 and Su-34 air strikes, high-ranking commanders of the terrorist group that were part of the so-called military council of IGIL, as well as about 30 middle-level field commanders and up to 300 militants of their personal protection, were killed.
The Russian Ministry of Defence says its forces may have killed ISIL's leader Abu Bakr al-Baghdadi in an airstrike, south of Raqqa on 28 May, and currently is seeking confirmation.