Internationalism does not need to be separate from local improvements, but internationalism must be a focus to avoid PatSocs.

As for the purges and famines, the highest estimates from credible sources put the death toll of the Great Purge at no more than 700,000, and the famines weren't intentional, and moreover were ended by the Soviets in a country that had regular famine before collectivization. That's why I question the "millions" numbers.

I don't think we need to dwell on Stalin, your take isn't entirely divorced from reality like many others tend to be, though I would recommend reading into Soviet Democracy.

Tax rates aren't the same as social services, you'll see dramatic drop-offs after the USSR fell in both.

The vast majority of what is consumed in the Nordics is created in the Global South, and again, these countries engage in usury relationships with the Global South. China does not engage in the same kind of relationships in quantitative or qualitatively equivalent means, as they focus on exporting commodities.

Ultimately, I'd recommend looking more into critiques of the Nordic Model.