Russia has an authoritarian presidential pseudodemocracy with a pronounced nationalistic, socially conservative vibe. They tend to get along fine with rightwing nationalists elsewhere. The Russian economy is mixed. It baffles me when I hear people (usually, but not always, Americans) call Russia communist. Maybe over 30 years ago (sort of) but in the frigging 21st century?! Even Soviet Russia was a socialist country, not a communist one.
China obviously has an extremely authoritarian one-party rule under an all-powerful president. The Chinese economy is mixed. It is nominally a communist country - and I assume that
@Virtual ghost meant China when he said "communist" - but that word carries little meaning these days. While the revolution might have been progressive in some ways in its day there still is enormous economic inequality. And today's China under Xi is not only more and more authoritarian compared to a decade or two ago but there is also a strong push from the government to return to traditional ancestral values (specifically confucianism) and become more conservative.
I think the term "communist" is an empty shell unless it is immediately accompanied by a clear definition. Some countries at some points in history have strived for it or used its name but it is more of an abstract ideal. At some point, 70 -120 years or so ago it was the ideal of many artists and intellectuals in the world (not just the West) held dear until the reality in the Soviet Union scared most of them away. The attempts at implementation have all been less than convincing. For the last 40 years or so the word has mainly been used by rightwingers (not only, but mainly in the English-speaking world and especially in the US) to describe anything vaguely leftwing that they consider too radical.
When
@Virtual ghost talks about "reformed communist" in the context of Eastern Europe these are usually the heirs of the previous regimes who favor a big government, mixed economy with greater government oversight and are for the most part pro-Russiam and socially conservative. The closests thing in my country might be Sarah Wagenknecht and her BSW.
There are precious few countries left that one might call communist: North Korea, Cuba ... maybe Nicaragua and Venezuela. But these don't really form a block.
I am not really convinced though as to how much sense a division into these blocks actually makes.