I was born in Russia and only spoke (and stuttered) in Russian up until I moved to the United States at age 7. My mom noticed that I stuttered less when I spoke English, so she let me speak English more than Russian at home - which resulted in me losing a lot of my Russian speaking ability. Anyways, I stutter in all of the languages. Russian does feel worse, and I assume its because its more consonant-heavy, and consonants are what I trip over the most.