Has Putin lost control?

On Saturday morning it looked like we might see the collapse of one of the world's longest standing dictators, Vladimir Putin. By Monday things were suspiciously calm, and the uprising against him - by his own former chef - was being flat out denied. So what just happened in Russia? Was it the start of a revolution? Or a massive mistake? Will this weaken Putin's grip or strengthen his hand? And what to make of the mercenary leader - Prigozhin- who is literally in it for the money? We talk war tactics and the psychology of an autocrat.