This is probably one of the best times for Germany to knock the Russians down a peg or two. The Russians are in the midst of great turmoil due to their defeat to the Japanese. The threat of another common enemy will either rally the Russians behind the Tsar or further fracture Russia. I think that the other great powers will be reluctant to intervene to save Russia, since it doesn't look like it will be able to pull it's weight in an alliance. The French are the only ones who will probably intervene. This is before the Schlieffen Plan was adopted, so the Germans will probably try to hold the French in Alsace-Lorraine and focus on Russia, thus avoiding near-instant British entry into the war. The British will probably sit this one out. The Ottomans might join to get some land out of the Russian bear, and the Japanese might be tempted to overturn some of the more unjust (in their view) provisions of the Treaty of Portsmouth.
I'm somewhat skeptical of the Germans supplying Polish revolutionaries, since Germany had its own Polish minority to deal with. However, it's not too implausible, so I'll accept it.