All 3 smaller conflicts you just mentioned were all in Europe, and mostly (Spanish revolutionaries and nazis) were perpetrated by fascist. Again I don’t really see the similarity between the 1930s in Europe and the 2020s today. Maybe you could say the Yemeni war is similar to the Spanish civil war in that it’s a proxy conflict- though spains civil war didn’t last as long and had fewer foreign players.

The Japanese even had the anti-Comintern pact of 1936, the precursor to the tripartite pact, that really drew the lines of who was on what side. Again, aside from Russia and China bolstering relations I see almost no similarities between the conflicts happening now, and the Spanish civil war, the invasion Czechia and Austria, and the annexation of Finland. (Well I guess the last one is Russia invading it’s neighbor again, but no one would say wwII started because Russia invaded Finland).