Ok, here is a map I have done regarding a Napoleonic victory over the Russians. I wasn't sure exactly how to do a detailed POD that could allow such a thing to happen without France getting totally smashed in the process, so I decided an ASB one for now, and am wandering how you guys would react to the subsequent treaties involved.
Basically, a wormhole opens above St Petersburg leading to a parallel dimension in the future. In this dimension, there are greater quantities of natural Uranium and hydrogen in northern Russia than OTL and so millions of years later, the Soviets are able to exploit this better. They develop a Tsar Bomba which is even more impressive and enormous than ours, measuring at a staggering 120 megatons in explosive power. The wormhole opens just below the bomb as it is about to detonate-and well, Napoleonic St Peters-burg is obliterated, and its civilisation destroyed. Radiation spills as far south as Moscow (even there they receive an hourly dose of 3 rads and devastates the Russian army. The army and civilians alike crap themselves and with no organised structure begin falling into chaos, many seeing it as a divine intervention and punishment for Russia. Even the Napoleonic invaders begin feeling the effects of it, but they try to stay clear of the northern regions and go for Moscow, which is at least reasonably clear. Napoleon does however take advantage of their disorganisation to evoke a vicious peace treaty upon them, with the Swedish, Ottomans Persians and even Chinese jumping on the bandwagon too to take some territory. The new Russian Republic is powerless to stop them, with so much dissidence. Some nobles escape to Alaska and the far East and establish a Tsardom there away from the chaos in Russia proper. Having a considerably smaller and more leisured invading force than OTL, Napoleon is able to counter and invade Spain and Portugal, winning a Waterloo like battle and decisively defeating the British, who only give up their West African possessions in exchange for peace. Napoleon of course consolidates his power, by setting up a new Polish-Lithuanian Commonwealth (consisting of greater Poland, East Prussia, Silesia, Lithuania, Belarus, Smolensk and some of Western Ukraine) and a Baltic Duchy out of Russia, though they still have to deal with radioactive fallout. The Ottomans take Bessarabia, Crimea and Georgia, the Persians Azerbaijan and the neighbouring areas, and China takes back the Transbaikal region. Former St Petersburg is smothered in radiation over 50 times greater than that of Chernobyl and is declared uninhabitable for many years to come, with the Swedish attempting to claim it but ultimately failing. Russia begins to sway toward democracy to appease the tired hungry masses, and healthcare is ensured to protect the many dying civilians. Prussia is completely split up between Poland and the German confederation, which in turn is absorbed by the Napoleonic Ally of Austria to stabilise the region. Switzerland is similarly partitioned on ethno-linguistic lines. Napoleon grants independence to a unified Italy and even gives them Dalmatia to handle things more easily, but gradually tensions begin to arise over the Italian claims in France and Africa, and the two gradually begin to distance themselves from each other. The map below is 1830 approximately. Sorry about the quality, I'm using a new computer as I'm at university and something strange happened with this particular image. Its generally quite ASB in how it occurs, but I'm hoping there is a more plausible way to have a Napoleonic peace Treaty in future.