Left this idle for quite a while, recently developed a little more. Here's the story in Russia:
In Russia, the disastrous defeat of 1915 and the humiliating peace imposed by Germany bring popular discontent with Czar Nicholas II and his German-born wife, Alexandra, to near boiling point. The economy suffers heavily from the loss of resources to the German client states, and poverty and hunger become more severe. In mid-1916, bread riots and anti-government protests break out in major cities across the country. Mutinies occur in the army, as soldiers are unwilling to support the czar, who they blame for their humiliation in the war. Nicholas is ultimately forced to abdicate in favor of his son, Alexei, and to go into exile in Britain. Instability continues, however, as the Duma clashes with Alexei’s regents over demands for broad political reforms, and the new government is unable to revive the economy. Radical groups, including Bolsheviks and anarchists, sow disorder and are attacked by the army on several occasions.
The government’s ability to control the far-flung territories of the country is eroded, and some ethnic minorities begin see an opportunity to break away. In 1921, with few Russian troops left in the Caucasus, Georgia, Armenia, and Azerbaijan declare independence. Several central Asian minorities also revolt, though they can muster much less military resistance. The army’s attempts to reconquer the Caucasus are repelled with surprising ease, and Britain and France urge Russia not to risk coming into conflict with Turkey, as a provision of the 1915 treaty barred Russian troops from areas near the Turkish border.
Enfeebled by his hemophilia, Alexei never assumes power himself, and dies in 1930 at the age of 25. He is succeeded by his father’s brother Michael, who attracts little public support. Socialist groups are gaining stronger support, including within the army. In 1933, a coup deposes Michael and the socialist-controlled Duma declares a republic. The new government scores a boost in popular legitimacy by reclaiming the Crimea, with the help of the local Russian majority. A federal system of government is adopted, and Belarus is persuaded to rejoin in 1938.
In the years following the withdrawal of German troops, the Eastern European states face the difficult task of steering an independent course between both Germany and Russia. Making this more difficult, they run into some disputes internally and with each other. Their form of government and status of their German-installed monarchs present the most immediate questions. In Poland, Prince Karl Stefan succeeds in making himself thoroughly Polish, and winning public favor over the republicans in the nationalist movement. He forces his father, Stefan, to abdicate in 1930 and takes the throne, completing his transformation by assuming the name Casimir V. Polish territory is expanded further, with Lwow captured from Ukraine and some Polish-inhabited territory from Lithuania and Belarus. Casimir’s realm emerges as the strongest of the new states, forging close ties with its neighbors Czechoslovakia and Hungary, as well as with Britain and France. Relations with Germany are even somewhat improved, and in 1934 the reformist SPD government agrees to return the Polish Border Strip.
The German minority-dominated governments of the Baltic states do not long survive the German withdrawal. In 1931 Duke Adolf Frederick is deposed and the United Baltic Duchy splits into the republics of Estonia and Latvia. The death of Mindaugas II (Wilhelm of Urach) in 1928, just as the German occupiers are withdrawing, provides Lithuania with an easy transition to a republic. Frederik Karl of Finland survives, having been uniquely able to ingratiate himself with his new kingdom without a German military presence.