Question: Russian Roulette is the which number studio album by German heavy metal band Accept, released in 1986, it would be the last Accept album to feature Udo Dirkschneider as lead vocalist, Dirkschneider is a German heavy metal singer? 
Sentence (from "Udo Dirkschneider"): After leaving Accept in 1987, he formed U.D.O., with whom he has enjoyed commercial success as well.
Relevant evidence: No