The Great War of the Quartet (The Imperial Timeline Book 1)
A conflict over Serbian Macedonia in 1934 has spiraled out of control, and after six months two large power blocs are fighting each other across the globe. The Entente headed by a rising Russia and a declining France and their allies face the Quartet of the central European great power of Germany, the diverse Austrian Confederation, the Asian powerhouse of Japan and little Bulgaria in a war that is no longer about the borders of a small part of the Balkans but about the balance of power across Eurasia and the rest of the world.
In 1935 as the two year anniversary of the war is approaching, Germany and Japan are each planning large offensives against Russia in Central Asia and in eastern Europe in the hope to break the slow-moving progress of the war so far.
The story is set in an alternative timeline with several minor and major divergences going back to the 1500s, the world in this timeline is fairly similar to our own, however, with the enormous power of Japan in the Pacific and across large swaths of Asia and with Germany and Russia fighting over domination of the European continent, the future looks like one where monarchy and authoritarianism is the norm and republican governments a curious sideshow in history, the isolationist great power of the United States notwithstanding.
Update May 4, 2015: Some re-editing, fixed typos, clarifications, etc, but no revisionism.