Eastern Europe 10 years after the Great war.
POD: The Russian empire encrypt their radio's and thus are able to win the battle of Tannenberg forcing the German empire to pull many divisions from the west to reinforce the east.
This leads to a French offensive that does surprisingly well and manages to liberate Belgium and by the start of 1919 the allies reach the Rhine and Russia have taken western Prussia. The Austro-Hungarian empire is racked by Revolution and Germany had seen a communist uprising kill the Kaiser the Central powers capitulate of January 10th 1915.
In the peace of Versailles,
From Germany:
Russia took Prussia east and west, eastern half of Posen, and eastern half of Silesia.
Russia was given a 5 year military basing right of German lands east of the Oder.
France took back Alsace-Lorraine
France was given a 5 year military basing right of German lands West of the Rhine.
Britain was owed by Germany 12 billion pounds in reparations to be paid in gold over a 30 year period, interest free. Since Russia and France took land they waived a reparation payment.
The German navy was reduced to 1/3 that of Britain and its army to 1/2 it original pre war peace time. This was done in order to make sure Germany was weaken but not too weak that communists and other revolutionaries may take over from now "mourning" monarchy.
From Austria-Hungary
Russia took Galicia-Lodomeria, Bukovina and Transylvannia (Which was traded with Romania for Moldova)
Serbia was given Vojvodina, and the King of Serbia was made King of the Croat, Bosniaks and Slovenes.
Czekslovakia was created.
Hungary and Austria were seperated and while reduced both were given guaranteed access to the sea via the Danube.
From the Ottomans
Constantinople was made an international city
Greece was given all lands and islands east of the 30th meridian east
Armenia was created and the arabian lands of the Turks were divided between the French and British.
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Italy tried to claim Trieste and Trento but was rejected by the Vicotrious allies as they did not participate in the war
With war over Russia focused on the east Annexing parts of Manchuria and Turkestan from the warring states of China.
Edit: grammar