As a Finnish speaker, I must disappoint you that both Russian and English do have broken alphabets (although this might not affect their character coding). English makes extensive use of silent letters and letters whose pronunciation is dependent on the context (word) they appear in (take e in "context" and "appear" as an out of hat example). I haven't studied much Russian, but I know that the letter ъ in their alphabet is never pronounced, and instead used to modify the pronunciation of the preceding letter.