there has been no sign of yevgeny prigozhin. his news service tells cnn he will answer questions when he has proper communication. one thing, though, is clear. this insurrection marks the most profound threat we've seen to putin's 23-year-long rule, and the u.s. secretary of state says the turmoil may not be over yet. >> it's too soon to tell exactly where this is going to go. and i suspect that this is a moving picture, and we haven't seen the last act yet. but we can say this. first of all, what we've seen is extraordinary, and i think you see cracks emerge that weren't there before. >> the military revolt lasted less than 24 hours, was it was long enough to bring into question vladimir putin's aura of invincibility and stability, damage his self-proclaimed reputation as a leader who never forgets a slight, never tolerates disloyalty.