Bruno's journey home from Manchuria was as long as his visit to it. But it allowed him to further pursue the friendship he had established with a captain in the German Navy. As a result, he spent the next two months in these efforts.
But two months was a long time, especially in terms of geopolitics. Many things could happen within such a duration, and many things did. Not only had the Russo-Japanese war officially come to an end, with the Empire of Japan gaining significantly more out of it than they had in Bruno's past life. There were also significant events with two other major powers in the current world.
First and foremost, Bruno's actions had moved up the Russian Revolution of 1905. A month after the Russo-Japanese war came to an end in September 1904, while Bruno was still in transit to the fatherland. Lenin returned from his exile in Europe and succeeded in mending the rift between the two major Marxist forces in Russia.