EDIT: Now with description! Not entirely all that realistic, but I made more out of boredom than anything.
Note that this WWIII world is not our future, but that of a different timeline.
[...]
German Union
The German Union was formed after the collapse of the Eurozone and the European Union, starting at first as a common currency and economic agreement between Germany and Austria, later with the inclusion of Luxembourg. The new Großdeutsche Mark was able to be what the Euro was once dreamed of being, with smart economic planning having spared the three nations much of the strife the "Euro-pocalypse" has brought the rest of continent, the Mark even having greater value than the US Dollar. As the Russians became more militant, Germany, Austria, and Luxembourg agreed to have the economic alliance also become a military one, with full integration as one Federation occurring just prior to the Third World War as rising tensions made many like the idea of strength in numbers. After the war, outside of the annexation of German-speaking Belgium to the administration of Luxembourg after the Implosion of Belgium, Germany has made no official gains; instead they simply militarily occupy much of Eastern Europe that lies north of the Balkans, in counter to the Russian occupation of the Baltics, Finland, and Arabia. Most people under German rule in these areas refer to the government as "The Fourth Reich", calling their own "cooperative governments" the rather diminutive title of "Reichskommissariat". However, they harbor no true ill-will, believing the Germans are a far better master to the Russians they had once been under in decades past, and the fair and open elections maintained by the German military, and in Germany itself, has allowed for the growth of the Integrationist Movement, who call for the German Union to officially bring in its occupied territories as equal members of the federation. Some argue the name should be changed to the "Mitteleuropan Union" but some don't even go that far. Many Germans support the idea, but others are opposed, not out of racism or anti-imperialism, but because granting the regions equal rights might mean the a less secure buffer between Munich and Moscow...
A democratic Fourth Reich? That's possibly the weirdest thing I've seen on this site. Also, you're using the "Weimar colours", but in the wrong order, maybe to make the flag look more Austrian... Just what happened in said different timeline? PoD before or after 1945?