Belgium never secedes from the Netherlands. The initial revolt in Brussels is put down a couple days after it starts. The Dutch are big enough to try to stay in the game as a big player, so they buddy up to Prussia during the course of its expansion. The German unification diverges when the French manage to squeak a victory in 1870. That leaves them as the last obstacle to German unification.
Bavaria, Wurtemburg, and Baden become dependent allies of France. The Franco-Russian Entente still forms. France's better position and increased stability mean it can invest a lot more in building up Russia. Russia was already starting on an exponential growth curve in 1914, in this TL a Great War doesn't come till 1919.
France and Russia are vastly stronger, but Britain stays neutral and Italy and the Netherlands take the side of the Central Powers. On the plus side, since the British haven't switched positions on the Ottomans (from protecting them from Russia to offering them to Russia), the Turks stay neutral as well.
France overruns Wallonia and much of Prussia west of the Rhine. The Prussians and Austrians invade the south German states from three sides. Trenchlines stretch along the Rhine, through southern Germany, and right against the Italian-French border (the Italians still can't fight in this timeline). The Russians sweep repeatedly into East Prussia and Galicia, consistently outmanouvered, but pressing forward by sheer weight of numbers and a much better infrastructure for a war than in OTL. The battles in East Prussia and Poland aren't quite as disastrous for Russia.
Eventually the Eastern Front becomes almost as stable as OTL's Western Front. The Central Powers make grinding progress into south Germany because of its relatively extended position. France inches into Flanders. Italy mounts a glorious series of offensives that lose it several miles. Prussian and Dutch engineers put out the first panzers in the spring of 1921, France has some that fall. Russia mass produces them and puts them out in droves starting summer 1922. Tank battalions edge their way over the Carpathians and reach the outskirts of Danzig. Romania, Serbia, and Montenegro declare for the Entente. Last ditch Western offensive by Central Powers is rushed and desperate - what's left of Wurtemburg and most of Baden fall, but the attackers are spent. Italy collapses, then Austria-Hungary, then Prussia.
Britain intervenes to prevent too much landgrabbing, but there's little they can do. The threat of war is less than impressive given the state of things on the continent. France annexes OTL Belgium and Luxembourg, half of Prussia-west-of-the-Rhine, plus most of the colonies of Italy and Prussia. Russia takes East and West Prussia (forcing a name change to Brandenburg), Posen, and Galicia. Serbia and Montenegro split OTL Yugoslavia. Rumania gets Transylvania. Independent Hannover and Hungary.
There ya go. With the added bonus that the future of this TL would be very interesting (in the Chinese sense).