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? 
Udo Dirkschneider: Udo Dirkschneider (born 6 April 1952) is a German heavy metal singer who rose to fame with German heavy metal band Accept.
i don't know