Crimean War
Once upon a time, there was a Russian Tsar and he was named Nicholas, and he was known as Nicholas I of Russia, his rallying cry was Orthodoxy, Autocracy, and Nationality, he was also highly expansionist, as he fought many other wars against other powers such as Persia, to get land in the Caucasus region and around the Black and Caspian Seas for the Russian Empire. The next country that will come under the threat of invasion from the ever expanding Russia in 1853 and that would be the Ottoman Empire, the Crimean war would be the deadliest war since our timelines Napoleonic Wars or in this timeline the deadliest war since the French and Indian War, it is believed that the war could of happened due to religious disagreements between Catholic France and Orthodox Russia, one of the largest goals of Russia during the 19th century would be to get a warm water port, and to conquer Orthodox and Slavic lands in the Balkan region of Southeastern Europe, the Russians also hoped to control Constantinople which was the birthplace of Orthodox Christianity.
The European powers wanted to maintain the balance of power as stated under the Congress of Vienna in our timeline, but in this timeline without the Napoleonic wars, which would mean there would be no Congress of Vienna, but the European powers wanted to maintain a balance of power long before the Congress of Vienna, a perfect example would be the War Of The Spanish Succession in 1700-1714, where most of the entire European continent was fighting against the combined empires of France and Spain during a succession crisis, and the French during the War Of The Spanish Succession almost conquered much of Europe as well. The same thing could and would be said for this, but with Russia in the Balkans, so both Britain and France would join up against the Russia to maintain the balance of power, and to prevent Russia, from conquering much of the Ottoman Empire as well. The British and French would win the war against Russia, like they did in our timeline, the British and French would still be allies against Russia because the French and British in our timeline were allies against Russia in our timeline because they kind of had to in order to preserve the balance of power.
The main places where the French and Russians would be rivals would be in Central Asia because the French are based in India and the Russians based in Siberia and Kazakhstan and to a much lesser extent North America where the Russians are based in Alaska while the French are based in Canada which is known as New France, and yes due to the French presence in India, I forgot to mention British reactions to the French in India. It would cause the British to look elsewhere for colonies and the British are going to take some off of the Dutch such as South Africa, Malaya, and maybe even Indonesia, so Southeast Asia would be a stronghold for the British Empire due to the French presence in India. The British would take South Africa in 1806, Malacca in 1824, and Malaya in 1826, the same as our timeline, because the British would still want those colonies, and the British didn’t give those colonies back to the Dutch after the Napoleonic Wars in our timeline. The French presence in India would make the British want more from the Dutch so the British would take Indonesia sometime around 1820s most likely 1828.