Not that I ever had to actually speak Ukrainian, I knew it so much better than the vast majority of our political elite. However as I was leaning Polish I have discovered that it sneakily replaced Ukrainian in mind. Just a couple months ago I have met a moron here in Warsaw who went to accuse me of shit and I wanted to answer him in perfect Ukrainian and... I couldn't. Not a word. All Polish.
Anecdotal account.
Not that I ever had to actually speak Ukrainian, I knew it so much better than the vast majority of our political elite. However as I was leaning Polish I have discovered that it sneakily replaced Ukrainian in mind. Just a couple months ago I have met a moron here in Warsaw who went to accuse me of shit and I wanted to answer him in perfect Ukrainian and... I couldn't. Not a word. All Polish.