Russian Foreign Minister Sergey Lavrov says he can't definitively confirm the death of the Islamic State group's leader in a Russian airstrike. The Russian Defense Ministry claimed earlier Friday that IS leader Abu Bakr al-Baghdadi was killed in a Russian strike in late May, adding that the information about his death was still "being verified through various channels." Lavrov said that "past examples of similar actions to strike the leadership of terrorist groups were presented with much enthusiasm and pomp, but the experience shows that those structures later regained their capability." The Russian Defense Ministry said al-Baghdadi was killed in a Russian strike in late May along with other senior group commanders.