I’ve answered this before. Copypastaing myself.

Honest question from a non-communist, based on your reply here. Does one need to support Putin to be a Marxist?

In a word, no. In a few more words, support for Russia (not Putin, as historical materialists don’t subscribe to great man theory) is only a partial, temporary, tactical one, in the context of imperialist liberation. Russia is still a capitalist state, though, so it’s a two stage strategy: first liberate colonized bourgeois states from colonizer states, and second revolution within those liberated bourgeois states.

Russia is an interesting case: it has already liberated itself from the post-Soviet “shock therapy” neocolonizers. This occurred during Putin’s administration, which is why he is especially hated by the US. So now the support for Russia is in the context of keeping the colonizers from recolonizing it, and supporting Russia to the extent that it helps other states liberate themselves. But Russia isn’t trying to “liberate” Ukraine, at least not all of Ukraine. It’s trying to resolve the genocidal attacks on the people of the Donbas, and it’s trying to resolve the imperialist military expansion at its border.

• Robert Parry, 2015: The Mess that Nuland Made
• Jeffery Sachs, 2023: The War in Ukraine Was Provoked—and Why That Matters to Achieve Peace

Also, Ukraine really does have a fascism problem and has for a long time, and the coup government has materially supported it.

• BBC, 2014: Ukraine underplays role of far right in conflict
• Human Rights Watch, 2014: Ukraine: Unguided Rockets Killing Civilians
• The Hill, 2017: The reality of neo-Nazis in Ukraine is far from Kremlin propaganda
• The Guardian, 2017: ‘I want to bring up a warrior’: Ukraine’s far-right children’s camp – video
• WaPo, 2018: The war in Ukraine is more devastating than you know
• Reuters, 2018: Ukraine’s neo-Nazi problem
• The Nation, 2019: Neo-Nazis and the Far Right Are On the March in Ukraine
• openDemocracy, 2019: Why Ukraine’s new language law will have long-term consequences
• Jacobin, 2022: A US-Backed, Far Right–Led Revolution in Ukraine Helped Bring Us to the Brink of War
• Consortium News, 2022: Evidence of US-Backed Coup in Kiev
• Al Jazeera, 2022: Why did Ukraine suspend 11 ‘pro-Russia’ parties?
• History of Fascism in Ukraine: Part I, Part II, Part III, Part IV