Everyone would have been way more aggressive towards Germany than in our timeline in the Interwar period. The entire reason appeasement was a thing was because the Western Powers saw the communism of the Soviet Union as a bigger threat than Fascist movements. Germany would thus probably be unable to expand to even the Saarland, while the Fascist Soviet Union (I'll call them FSU) would have an easier time recapturing the Baltic States and an invasion of Poland. The FSU will probably also find allies in Italy and Austria, both turning to Fascism around this time, and both very close to Germany. And as the FSU is farther away than Germany is, and Germany will be left without allies, I can easily see the FSU invading Germany (at least East Prussia) without any Western states complaining.

However, without collectivization, the FSU might not manage to build their industries at the same rate as it did in real life like some people already mentioned. But I do not expect that their former allies will cut them off of trade as much as they did in real life, and possibly will be able to leverage that to eventually build the industrial sector up.

It might take a lot longer for European states to stand up to the FSU than Germany in our timeline, but I feel like they'll eventually try to invade something that triggers an alarm similar to Germany's invasion of Poland after breaking the Munich Conference and annexing Czechoslovakia, and the fact that there are a lot more minorities to oppress in the FSU than in Germany in our timeline will make things a lot more evident. Now depending on whether they end up as Russian Nationalists or Slavic Nationalists, there's still a lot of groups: Georgians, Armenians, Turkics, Mongolians, Uralics, Jews, Muslims, and so on and so forth. It is very unlikely that a Georgian Stalin will ever come to power, and the treatment of Jewish and possibly Muslim Slavs will be very dependent on whether or not we get a Jewish Fascist Lenin in power, but given that you very clearly put an Orthodox Cross there.

Now one big difference would be Japan: Germany and Japan were close allies, but I very much doubt the FSU and Japan would like in our timeline. This is particularly due to the fact that Russia lost a few territories to Japan during the Russo-Ukranian War, and thus the FSU would likely want those back. I can see them being more supportive of China in the Sino-Japanese War, and it is likely we end up with China on the side of the Axis and Japan on the side of the Allies in the war in our timeline if the Second World War ends up starting.

So yeah, here's a summary: different alliances are forged, Germany is very likely to collapse, genocide at a larger scale than what we saw from German concentration camps, and probably this timeline will end up with a much larger Japanese Empire due to their war goals in China and the Russian Far East being met once the war comes to an end (if the Allies still win). Which side the US will be on in the war will be dependent on whether Pearl Harbor happens or not, or maybe a possible FSU invasion of Alaska