I'll repost something from another thread, with regards to a Strasserist-Soviet Alliance:
First, in order to get a Soviet alliance you'd need to remove Stalin, who was notoriously paranoid of foreign factions not under his thumb and the Strasserists certainly wouldn't be; there are luckily more than enough ways to achieve this in the 20s, luckily. With that out of the way, I can't stress enough how much this axis changes the fundamental nature of the war. Access to the Soviet resource base and labor pool means Germany removes the biggest impediment to its IOTL buildup and running of its war machine, which was the critical, persistent shortage of raw materials and manpower. With the aforementioned resolved, the Germans would be able to build up much quicker and far more effectively, as well as keep production strong throughout the conflict. German technical knowledge and military expertise, meanwhile, will significantly boost the efficiency and productivity of Soviet industry and the combat capabilities of the Red Army. Further adding to their power is the extensive Soviet spy net which would be working in favor of this duopoly, which would certainly benefit their strategic actions as well as harm Allied(?) industrial efforts; guys like Klaus Fuchs can certainly sabotage the Manhattan Project, for example.
To get an idea of what this would mean, according to Paul Kennedy's The Rise and Fall of the Great Powers, the IOTL Axis Powers of Germany (14.4%), Japan (3.5%), and Italy (2.5%) held a combined total of 20.4% of the global warming potential in 1937. The Soviet Union, meanwhile, held an even 14% under the same conditions, meaning the starting base of this ATL Axis has at least 28.4% of the global warmaking ability, which is nearly a third greater than that of the OTL Axis even before you factor in the increased abilities of this alliance, which I think would definitely boost their combined total up to 30%. The U.S. (41.7%) and UK (10.2%), meanwhile, have a combined 51.9%, which remains the same in this ATL. It's now important to note that the historical Big Three of the U.S., UK, and Soviet Union with 65.9% of the global warmaking power took six years to defeat the Axis who had just 20.4%, or a third of their abilities; this ATL Axis of Germany and the Soviets are two thirds of the Anglo-Americans. To say the least, you're definitely looking at a long, costly war that will reach into the late 40s no matter what, likely until American industry can produce sufficient quantities of B-36s and nuclear weapons to begin nuclear bombardments, if Anglo-American political willpower doesn't break first.
Now, with the base of the Alt-Axis covered, who else will join it and who won't? Well first, Imperial Japan is certainly out, as there is no real way to resolve the disputes between them and the Soviets and to that end it will be better for the Germans to just increase their relationship with the Chinese. To that end, you'll thus likely see an Allied Japan and an Axis China under the KMT, which will finish off the CCP before things kick off with the help of Stalin. Another is that Hungary will most likely side with the Alt-Axis, given they were willing to work with the Soviets IOTL 1940 to invade Hungary, as their interests don't exactly clash in the Balkans. The last one, that I'm reasonably sure of, is that the Axis will definitely make greater appeals to the colonial peoples as compared to IOTL, in particular the various Islamic ones they couldn't due to the Italians and Vichy, as well as the Indians thanks to Soviet connections with them. I definitely think Strasserism, with its similarities to Ba'athism, will play well in the Arab world. Outside of these three predictions, I'm not entirely sure and I think it could go either way.
The first option is that, given the arrival of a Leftist alliance of a Strasserist Germany and the Soviet Union, the Stresa Front will be firmly welded together and its first real test will be supporting the Nationalists in Spain against the Axis-backed Republicans, who are more thoroughly dominated by Socialist elements as compared to OTL. In such a case, I can see the war ending sooner in a Nationalist victory, perhaps with Primo de Rivera in charge as opposed to Franco due to the Falangists fanatical Anti-Communism. Undoubtedly during this time, the Soviets will be using their agents to further stir up the Left-Right discord in France, which will most likely be ended by Petain and others stepping in with the military and forming a new Fascist government to control France. From this point forward, you thus get a Latin troika of three Fascist powers, aligned with first the UK and then the U.S. as well as Japan. Continued Italian support for Austria will prevent it from being absorbed by Germany, who will thus likely turn to sorting the Baltics out with the Soviets in the meantime while events in Spain are finished. Poland and Romania, with its fanatically Anti-Communist Iron Guard and under intense Soviet-Hungarian pressure, will grow close to the Allies. WWII will thus likely begin from a joint Axis attack upon those two nations which brings the rest in. Thus, the Second World War will be known as a conflict that saw Fascism and Capitalism unite to crush the Communists/Left-Nationalists, with the Japanese joining in for 1941 and the U.S. in 1942 in response to German submarine warfare.
The second option is that the Stresa Front still breaks down, and that Italy still joins the Axis. In this case, Austria will be annexed by Germany in 1937 thanks to Soviet support while the Czechs will be dismembered in early 1938 without much ability of the West to intervene thanks again to the same Soviet support. The Nationalists will probably still win the Spanish Civil War, but this time most likely under Franco, in order to appease the Italians, and the Spanish will then join the Axis. The French still probably have a coup by the Military to stabilize the domestic situation, but they will certainly remain in the Allies due to the growing threat of the Axis. Early 1939 will see the Baltics sorted out by the Germans and the Soviets, almost certainly under the same lines of the original Molotov-Ribbentrop Pact, with the Soviets taking Latvia and Estonia while dealing with the Finns while the Germans get Klaipedia and a Lithuanian puppet. Said puppet will then be used to set off the Second World War, in that it makes demands upon the Poles to give up Vilnius and such demands will doubtlessly be refused, resulting in an Axis invasion of Poland and Romania in late '39. From there, WWII occurs with the Japanese joining in 1940 and the Americans still waiting until '42 when German submarine provocations prove sufficient. WWII will certainly be a more confusing affair in the ATL future as reviewed by historical texts, due to obvious internal Fascist divide driven by Iron Guard Romania and Action Française in the Allies while Fascist Italy and Nationalist Spain in the Axis.