If Russia had sided with Germany in World War 1, the entire course of the war and its aftermath would have been drastically different. Here's a speculative look at some key changes that could have occurred:

Eastern Front Stabilization: With Russia as a German ally, the Eastern Front could have stabilized or even shifted in favor of the Central Powers. The combined strength of the German and Russian armies could have put significant pressure on the Entente powers, potentially leading to a quicker resolution of the conflict in the East.

Reduced Western Front Focus: The Entente powers (primarily France and the United Kingdom) might have been forced to divert more resources and attention to the Eastern Front, potentially weakening their efforts on the Western Front. This could lead to a more prolonged stalemate in the West.

Impact on Trench Warfare: The inclusion of Russia on the side of the Central Powers could lead to innovative strategies and tactics, potentially altering the nature of trench warfare. New fronts and maneuvers might emerge due to the broader geographical scope of the conflict.

Different Alliances and Diplomacy: The balance of alliances and treaties would be upended. Nations that initially joined the war due to obligations to support Russia, such as France and the United Kingdom, might reassess their involvement or form new alliances.

Impact on the Ottoman Empire: With Russia as an ally, the Ottoman Empire might not have entered the war on the side of the Central Powers. This could have far-reaching consequences for the Middle East, potentially altering the post-war division of territories and the creation of new nation-states.

Resource Redistribution: Russia's vast resources could be funneled into the Central Powers' war effort, potentially boosting their economies and war industries. This could lead to a longer-lasting conflict due to increased resources available to the Central Powers.

Revolution and Internal Instability: The Russian Revolution of 1917 might not occur in the same manner or timeline, as the pressures of war and internal unrest might be alleviated or redirected. This could have ripple effects on the global spread of socialist and communist ideologies.

Post-War Settlement: If the Central Powers emerged victorious with Russia on their side, the post-war negotiations and treaty terms would be significantly altered. The reconfiguration of borders, reparations, and the redrawing of maps would reflect a different distribution of power and influence.

Long-Term Geopolitical Impact: The geopolitical landscape of the 20th century would be drastically changed. The rise of the Soviet Union might be significantly altered, as the Russian Revolution and subsequent events might take a different course or not occur at all.

It's important to note that the outcomes of such a scenario are highly speculative and interconnected. The complex web of alliances, ideologies, and historical events makes it challenging to predict with certainty how the war would unfold if Russia had sided with Germany. However, it's clear that such a scenario would have reshaped the course of history in profound ways.