Observers said the decision by the founder of the Wagner private fighting force to turn his troops on Moscow was the most significant direct challenge to President Vladimir Putin's authority since he came to power.The Kremlin said earlier Tuesday that the Russian leader would not attend Prigozhin's funeral."The president's presence is not envisaged," Kremlin spokesman Dmitry Peskov told reporters.There were no public announcements of when or where Prigozhin, who was 62, would be buried.Putin last week described Prigozhin as a man who had made "serious mistakes in his life, but he achieved the right results."The Kremlin has dismissed speculation that it orchestrated the crash in revenge for Wagner's march on Moscow in June.