I am not certain they could, but it is not me who makes decisions, and those guys thought they could take Kyiv in 36 hours. It seems doable as paras could be reinforced much faster. The big problem is the none of those countries have depth to absorb initial attack, Ukraine's terrain is not great for the defender but at least it is a large country.

I was incorrect about the 5th column number. Lithuania is actually the best in this category with very few non-citizens. Seems like many left and some naturalized, current total is more like 8% not 33% like it was in the 90s. Latvia has the most but it is still much less than 20%.