Most Marxists do not uncritically support Russia, though opposition to the Nationalists like Azov in Ukraine is something common on the Left, and believe Russia's anti-US stance is beneficial for the Global South (see the string of African liberation movements in the past few years). Most Marxists can agree that the Uyghur people have been placed in re-education camps, but most do not believe they are being systemically murdered en masse like many people report. Most Marxists think the DPRK is doing surprisingly well for a country under extreme embargoes and was subject to more tons of bombs than the pacific front in World War II, not that it would be preferable to live there than in a highly developed country free from those problems.

That definition doesn't even apply to the people you're critising

I get called tankie from time to time, but 1a. I hate Putin's corrupt fascist oligarchy 1b. I fully support Ukraine!

2. The Uyghurs absolutely were mistreated, but it is hard to care about at the moment when the US and Isreal are carrying out an actual genocide. Also, neo-nazis have taken over the US and are illegally abducting minorities.

3. I think the DRPK is very problematic, but they seem to be doing well despite the US putting such ridiculously excessive embargos and sanctions on them. Overall they are probably no worse off than capitalist India and they are probably better off than most 3rd world capitalist nations like Iran, Brazil, Haiti, Afghanistan, etc...