A lot of American communists supported Stalin. They refused to believe that the anti-Stalin news was anything but American propaganda. When Khrushchev exposed Stalin for what he did in an attempt to try rebuilding the country, many were disillusioned to the point that they left communism. Some remained pro-Soviet but rejected Stalin, some remained communist but rejected the USSR as state capitalism, and some remained pro-Stalin. I’m just pointing that out to make sure that we all remember that people can be all over the place and still justify their positions to themselves.
To me, supporting Putin because he opposes NATO is like supporting Donald Trump because he opposes Biden. There are some accelerationists who literally do that. I personally think it is idiotic, and anyone who does so is a fascist and not a communist. Putin’s homophobia, xenophobia, right wing religious fascism, and misogyny should be more than enough to dissuade any person with a conscience from supporting him. Honestly, I really think it does. I believe that the majority of the “tankies” supporting Putin are right wing accounts sockpuppeting as leftists. No one who supports LGBT rights could support Putin. I think the tankies are the same type of crowd that populated the_donald - people cosplaying a political position until it becomes internalized.
There is an absolutely massive literature in American and Western communism. Most of it predates Putin - at least, predates Putin bring anything other than a mafioso with a superpower to fund his personal wealth. You can read all about the soul searching about actually existing communism vs ideological communism and the moral dilemma that resulted.
But insofar as it’s about opposition to American imperialism or accelerationism, I think that the Trump years should have shown that to be tragically misguided. Putin’s opposition to NATO isn’t helping anyone in the West except for people like Trump and LePen. It’s not like supporting Ho Chi Minh or Mao, and it’s certainly not like supporting Allende, Castro, or Che. It’s like supporting Hitler on the basis of Hitler being anti-British.