The international reaction of anarchist movements to Russia’s current war in Ukraine has overwhelmingly been one of solidarity with the Ukrainian people and resistance towards Vladimir Putin’s irridentism. However, there has been some variation therein, with almost no support for Russian aggression, which one can find plenty of among contemporary Marxist movements as well as among much of the West’s far-right. Such deviation from the position of supporting Ukrainian resistance to dictatorship has among foreign anarchist groups taken the form of complete resistance to all state-versus-state wars, instead making the case for “No war but the Class War”. It should be noted that this latter position does not always exclude the former of supporting the Ukrainian people in their current struggle, and one could argue that within the current conflict between states is ample potential for revolutionary action.
The banner from Sarajevo is from 2014. That "group" Slobodari (basically 1 or 2 people) was denounced by anarchists across the Balkans in 2014 as they took a Nazi turn and started publishing texts by Ukrainian "autonomous nationalists" and the like.