South America dwarfs Ukraine: about 17,840,000 km² km² against 570,135 km² km². At true size South America is about 31.3× larger — the whole of Ukraine fits into South America roughly 31 times.
The old Mercator map treated both about equally (1× vs 2.3× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Ukraine fits 31× into South America.