For over a decade, the Russian Empire and the German Reich had entered an alliance that opened up the board.
One of the stipulations of this alliance was joint military command, procurement, and training. From as far west as German Burgundy, to as far east as Russian Kamchatka.
If there was a soldier raised, a weapon manufactured, or a bullet pressed, they would operate under the same specifications.
To put it simply, the Russian Army was as large, capable, and fearsome as the German Army on their western border.
And they were united with blood, faith, and dynastic ties. When the news entered Saint Petersburg that the Empire of Japan had attacked German Naval vessels in the South Pacific.
And that Germany had responded through mobilization of its Colonial Forces, Tsar was quick to do the same, without even being asked by his cousin, Kaiser Wilhelm II to do so.