Russian, Ukrainian and Polish are the same language.
Unhinged take. I do not understand Russian or Ukrainian in the slightest beyond single words, besides one's a west Slavic language and the other two are eastern Slavic!
You probably said that because you disapprove of Polish and Ukrainian nationalism, but that's no reason to abandon investigation and speak with confidence anyway.
To indulge in personal attacks, pick quarrels, vent personal spite or seek revenge instead of entering into an argument and struggling against incorrect views for the sake of unity or progress or getting the work done properly. This is a fifth type [of liberalism].
...
Liberalism...is a corrosive which eats away unity, undermines cohesion, causes apathy and creates dissension. ... It is an extremely bad tendency.
Liberalism stems from petty-bourgeois selfishness, it places personal interests first and the interests of the revolution second, and this gives rise to ideological, political and organizational liberalism.
Correct as always, but if your goal is to stir shit up, saying Russian and Ukrainian are the same language is a pretty good way to do it. Mao wrote a lot about this.