Answer:
Russia would probably be forced under the thumb of Napoleon
Step-by-step explanation:
Napoleon would have a much better chance at winning all of the Napoleonic wars. After defeating Russia, he would be able to put his attention to the Peninsular War in Spain. Russia meanwhile would probably be severely punished. Unlike the 4th Coalition, Russia would be punished, and lose land, like Prussia and Austria had. It would probably not become a Republic due to being of historical importance, and it wouldn't be annexed by Napoleon because the Russian people would most likely rebel.