Parallelism in In The Presence of Mine Enemies

In the novel and story, the timeline splits off from OTL in Second World War, when the USA stays neutral and doesn't interfere in the war. This means that Nazi Germany and Japanese Empire carve up the rest of the world. In the 1950s, the two allies invade and conquer the America and dominate the rest of the world. The Greater German Reich takes the appearance of the Soviet Union in the latter's last days and there are many similarities. What follows is an attempt to document them. If you anything to add, go ahead.

Heinz Buckliger
Mikhail Gorbachev was the last General Secretary of the Soviet Union just as Buckliger was the last Führer of Germany. And like Buckliger, he reached this high post by rising through their respective governments by working in bureaucratic posts (Buckliger was Minister of Heavy Industry while Gorbachev was Head of Department of Party Organs).

Where there is most similarity is how Buckliger—and Gorbachev—institute reform in their respective countries. Buckliger was put under house arrest in Croatia while Gorbachev was in Crimea by the conservatives in their respective parties.

Finally, after both introduced democracy introduced in their countries, and planned to stay in power but both lost any real power.

Rolf Stolle
Rolf Stolle is based on Boris Yeltsin. For starters, both are depicted as something of buffoons (Heinrich Gimpel likened Stolle to Hermann Göring) atleast in the point of view of the general public and mayors of their respective countries' power centers. They also took great steps to portray themselves as 'man of the people' and were popular with the people they governed.

Both were known for supporting reforms and indeed becoming leaders of the democratic movements. And, importantly, both were opponents of the coups that tried to bring down the democratically elected governments in their countries (although the coup of the SS happened before elections). There is a differance however. In the coup in Nazi Germany, the SS, the secret police service, were the ones who rebelled and the reformists were saved by the German Army. In OTL, the (Soviet) Army was the one who attempted to take power.

Notably during the Soviet coup against reforms, Yeltsin stood on a Red Army tank defying his oppenents. In the novel, Stolle defiantly kicks a SS tank.

Kurt Haldweim
Kurt Haldweim has many aspects of Leonid Brezhnev. For instance, both had ruled their countries as long as the founders (Brezhnev ruled as long Joseph Stalin while Haldweim ruled only a few years less than Adolf Hitler himself).

It also in their tenure that their countries fell under economic stagnation.

The Führer's Palace
The Führer's Palace is based on the Russian Kremlin as the housing for the rulers of the country. They both have enormous squares in front of them (the Palace has the Adolf Hitler Platz in front of it as the Kremlin has the Red Square in front it).

The Adolf Hitler Platz
The Platz is very much alike to the Red Square in its size and splendour. Also, both places saw massive civil demonstration for democracy.

Major Authoritarian Superpower Dissolves
Like the Soviet Union, Nazi Germany's government was brought down due to civil disenchantment with the ruling regime. Due to frequent outrages by the secret police and next to none civil rights, the people of the Greater German Reich revolt by demonstrating against the Nazi Party just the Soviet people did against the Communist Party.

It both timelines, this happens due to the efforts of reformist rulers and mayors of the capital cities (Gorbachev and Yeltsin, Buckliger and Stolle, respectively).

Hardliners Stage Coup...and Fail
In OTL, the conservatives in the Communist Party rebel with the help of the Red Army, naming themselves the State Committee of the State of Emergency, with the aim of wiping out reforms that introduced democracy in the Soviet Union. In the Greater German Reich, the SS with help of Nazi Party conservatives, who together called themselves the Committee for the Salvation of the Greater German Reich, launched a coup to try and stop democracy in the Reich.

Both coup attempts failed due to civillian demonstrations and which were aided by the military (in OTL, the Red Army's mutinous soldiers. In the story, by the Wehrmacht).

Victorious Reformists Allow Occupied States To Secede
In OTL, after the Soviet Union held free elections, countries that been ruled by Moscow began to secede and establish their own republics, leading to the dissolution of the USSR. Same way, after the Reichstag elections, one by one countries ruled directly by Berlin began to gain their independence.