You asked, "In the following sentence, which one is better?"
1."By no means Dilma's suspension means an end to corruption in Brazil"
A: It would be, "By no means 'does' Dilma's suspension 'mean' an end to corruption in Brazil. But using "means and mean" so close together is a bit redundant. Doesn't sound good to me.
2. "In no way does Dilma's suspension mean an end to corruption in Brazil"
A: You could write that.
3. "Dilma's suspension in no way means an end to corruption in Brazil"?
A: This version is my personal preference.