This is true of younger people definitely, but most of the Ukrainians I know living in Europe struggle with the Ukrainian language. I know quite a few from Kyiv, Kharkov, Vinnitza, etc. They have also told me that they are getting some pressure to learn Ukrainian. I am not saying that Ukrainians will fall back to a Soviet culture for good, but if such a fallback permits a reprieve from the war, then some will do so just to survive--IMHO.