The spokesman for the US-led anti-IS coalition said in a statement Friday he could not confirm the Russian claim.
Moscow's Defence Ministry said the air raid on May 28 killed about 30 mid-level militant leaders and 300 other fighters.
"According to information that is being verified through various channels, the leader of ISIS". Both attacks would have occurred after al-Baghdadi's alleged killing.
There had been numerous reports in the past of al-Baghdadi being killed, but they did not turn out to be true.
The Russian defence ministry said on its Facebook page that it was checking information that Baghdadi was killed in the strike, launched after Russia received intelligence about a meeting of Islamic State leaders.
If true, then it would mark a major military success for Russian Federation, which has been conducting a military campaign in support of Syrian President Bashar al-Assad since September 2015.
He said Abu Yasin al-Masri is the same person as Abu al-Haj al-Masri, who the Russians on Friday said they killed near Raqqa in May.
"Russia has a long track record of issuing fake claims and deliberate misinformation during its campaign in Syria", said Charles Lister, a senior fellow at the Washington-based Middle East Institute. Reports suggest he was radicalised during the four years he was held at Camp Bucca, a United States prison in southern Iraq where many al-Qaeda commanders were detained.
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The ministry's statement said the Russian airstrike may also have killed 330 terrorists, state-run Sputnik reported. The air strike, targeted a meeting of IS leaders and was carried out on May 28, the agencies cited the ministry as saying.
Abu Bakr al-Baghdadi, which is a nom de guerre, was born Ibrahim Awwad Ibrahim Ali al-Badri al Samarrai.
"Baghdadi is present in Iraq and not in Syria", he told Asharq Al-Awsat, saying ISIS is now run by a 12-member leadership council that practically leads the terrorist organization. "It has been retreating on all fronts, and the death of its leader will accelerate its demise".
It said the IS leaders were discussing the group's withdrawal from Raqqa, with the military planning the airstrike after hearing that the leadership would be meeting.
The Russian military initially sent drones to monitor the area and then dispatched a group of Su-34 bombers and Su-35 fighter jets to hit the ISIS gathering.
In Iraq, the US -backed government has been battling to recapture Mosul since October a year ago after driving the group out of most of the rest of the territory it had seized.
Rami Abdulrahman, director of the Syrian Observatory for Human Rights, cast doubt on the report Baghdadi may have been killed.
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