In 1912, while the russian phisican and philosopher Alexander Bogdanov lives in an autoexile in France, the mysterious tzar's monk, Grigori Rasputin, dies assesinated (supposedly by a member of the Court, but probably motivated by foreign interests).
Bogdanov, known for his communist ideology, but also for his rivality with the Bolshevik leader, Vladimir Lenin; is called to replace Rasputin in the header of the Tsar's family.
The clever Bogdanov used this opportunity to take control of an unstable Russia, and carry out their unvelieable plans.
Another POD is Willhem II's decision to take change personally of the international relations of his Empire, priorizing his own familiar links over the interests of the most influential german people.
World War I
Those changes determines a modification in the alliances in Europe. Germany vinculates more strongly with Russia, but forget the blood links that vinculate they with Great Britain, that keep the 'Entente Cordiale' with France. Serbia is abandonated by Russia, and asks for help to the west. A dubitative and ambicious Italy answer the calling, and the two realms are get in the now named 'Cuadruple Entente'.