What do you see as the reasons for the pressure exerted on Napoleon during his negotiations

What do you see as the reasons for the pressure exerted on Napoleon during his negotiations with the Russian envoy P.P. Dolgorukov in 1805?

Prince Dolgorukov was sent to negotiate with Napoleon Alexander I in his place. The reasons were that he trusted this man. Dolgorukov was a supporter of the war. He believed that the Russian-Austrian troops would certainly win at Austerlitz. Such his confidence was reflected in the course of the conversation. As a result, he rejected all of Napoleon’s offer and acted very arrogantly in response to his benevolent tone. Contrary to Kutuzov’s opinion, he insisted on the battle. Later history showed him wrong.